One occurrence of a repeating event doesn't happen

calendar.event.cancel_occurrence

POST/api/v1/households/{household_id}/commands/calendar.event.cancel_occurrence

Command
Rigel runs it
Applies offline

Cancels a single occurrence, named by occurrence_start, without touching the rest. Use this for 'not this week', not a deletion. Cancelling it again changes nothing. Errors: event_not_found, event_owned_by_app, occurrence_not_found.

Parameters#

One occurrence of a repeating event doesn't happen: parameters
Field	Description
`household_id`pathstringrequired	The household's ID.
`Idempotency-Key`headerstringoptional	The command's ID. Reuse it when retrying the same command.

Request body#

JSON, as application/json.

One occurrence of a repeating event doesn't happen: request body fields
Field	Description
`event_id`stringrequired	A calendar event ID, such as evt_01JC0000000000000000000000.
`occurrence_start`stringrequired	Which occurrence, by its original start in the event's zone: 2026-11-14T09:00 for a timed event, 2026-11-14 for an all-day one. Use the occurrence_start that `calendar.occurrence.list` gave.

Response#

200 The command was applied.

One occurrence of a repeating event doesn't happen: response fields
Field	Description
`result`objectrequired	What the command returned, such as the IDs it created.
`version`integerrequired	The household version after the command.

Errors#

Every error has the same envelope: error.code, error.message, error.details, error.recovery and error.request_id.

One occurrence of a repeating event doesn't happen: errors
Status	Code	When
`400`	`validation_failed`	A field is missing, misspelled or out of range. details.fields lists each problem.
`401`	`unauthenticated`	The request has no valid session.
`404`	`event_not_found`	The event doesn't exist in this household. The event must exist.
`404`	`occurrence_not_found`	The occurrence doesn't exist in this household. A day the rule doesn't reach isn't an occurrence. An all-day key doesn't fit a timed event. An event that doesn't repeat can't have one occurrence cancelled.
`404`	`not_found`	The household doesn't exist, or you aren't a member of it.
`409`	`event_owned_by_app`	An event another app owns is refused.
`409`	`idempotency_key_reused`	The Idempotency-Key was already used for a different command.

Examples#

These are real. Each scenario is one of the command's test cases, run on a household when this site was built, and the response is what the API returned.

Cancelling one Saturday adds a cancelled exception and leaves the series alone

Request, curl

curl -X POST 'https://rigel.house/api/v1/households/hh_01K9BKKP003AHRZ6DMV29GQY5C/commands/calendar.event.cancel_occurrence' \
  -H "Cookie: rigel_session=$RIGEL_SESSION" \
  -H 'Content-Type: application/json' \
  -H 'Idempotency-Key: cmd_01JC4N0000AAAAAAAAAAAAAAAA' \
  -d '{
  "event_id": "evt_01JC000000000000000000000A",
  "occurrence_start": "2025-11-15T09:00:00"
}'

Request, TypeScript

const response = await fetch("https://rigel.house/api/v1/households/hh_01K9BKKP003AHRZ6DMV29GQY5C/commands/calendar.event.cancel_occurrence", {
  method: "POST",
  headers: {
    "Content-Type": "application/json",
    "Idempotency-Key": "cmd_01JC4N0000AAAAAAAAAAAAAAAA",
    Cookie: `rigel_session=${process.env.RIGEL_SESSION}`,
  },
  body: JSON.stringify({
    event_id: "evt_01JC000000000000000000000A",
    occurrence_start: "2025-11-15T09:00:00",
  }),
});
const data = await response.json();

Request, HTTP

POST /api/v1/households/hh_01K9BKKP003AHRZ6DMV29GQY5C/commands/calendar.event.cancel_occurrence HTTP/1.1
Host: rigel.house
Cookie: rigel_session=<your session>
Content-Type: application/json
Idempotency-Key: cmd_01JC4N0000AAAAAAAAAAAAAAAA

{
  "event_id": "evt_01JC000000000000000000000A",
  "occurrence_start": "2025-11-15T09:00:00"
}

Response, 200

HTTP/1.1 200 OK
Content-Type: application/json
X-Request-Id: req_01K9D9S2R0P9QNVX80S0WX3XD5

{
  "result": {},
  "version": 1
}

An occurrence that already has changes keeps them and is cancelled

Request, curl

curl -X POST 'https://rigel.house/api/v1/households/hh_01K9BKKP003AHRZ6DMV29GQY5C/commands/calendar.event.cancel_occurrence' \
  -H "Cookie: rigel_session=$RIGEL_SESSION" \
  -H 'Content-Type: application/json' \
  -H 'Idempotency-Key: cmd_01JC4N0000AAAAAAAAAAAAAAAA' \
  -d '{
  "event_id": "evt_01JC000000000000000000000A",
  "occurrence_start": "2025-11-15T09:00"
}'

Request, TypeScript

const response = await fetch("https://rigel.house/api/v1/households/hh_01K9BKKP003AHRZ6DMV29GQY5C/commands/calendar.event.cancel_occurrence", {
  method: "POST",
  headers: {
    "Content-Type": "application/json",
    "Idempotency-Key": "cmd_01JC4N0000AAAAAAAAAAAAAAAA",
    Cookie: `rigel_session=${process.env.RIGEL_SESSION}`,
  },
  body: JSON.stringify({
    event_id: "evt_01JC000000000000000000000A",
    occurrence_start: "2025-11-15T09:00",
  }),
});
const data = await response.json();

Request, HTTP

POST /api/v1/households/hh_01K9BKKP003AHRZ6DMV29GQY5C/commands/calendar.event.cancel_occurrence HTTP/1.1
Host: rigel.house
Cookie: rigel_session=<your session>
Content-Type: application/json
Idempotency-Key: cmd_01JC4N0000AAAAAAAAAAAAAAAA

{
  "event_id": "evt_01JC000000000000000000000A",
  "occurrence_start": "2025-11-15T09:00"
}

Response, 200

HTTP/1.1 200 OK
Content-Type: application/json
X-Request-Id: req_01K9D9S2R0PSV4ZT5SBR67VB0T

{
  "result": {},
  "version": 1
}

Cancelling twice changes nothing but the event's version

Request, curl

curl -X POST 'https://rigel.house/api/v1/households/hh_01K9BKKP003AHRZ6DMV29GQY5C/commands/calendar.event.cancel_occurrence' \
  -H "Cookie: rigel_session=$RIGEL_SESSION" \
  -H 'Content-Type: application/json' \
  -H 'Idempotency-Key: cmd_01JC4N0000AAAAAAAAAAAAAAAA' \
  -d '{
  "event_id": "evt_01JC000000000000000000000A",
  "occurrence_start": "2025-11-15T09:00:00"
}'

Request, TypeScript

const response = await fetch("https://rigel.house/api/v1/households/hh_01K9BKKP003AHRZ6DMV29GQY5C/commands/calendar.event.cancel_occurrence", {
  method: "POST",
  headers: {
    "Content-Type": "application/json",
    "Idempotency-Key": "cmd_01JC4N0000AAAAAAAAAAAAAAAA",
    Cookie: `rigel_session=${process.env.RIGEL_SESSION}`,
  },
  body: JSON.stringify({
    event_id: "evt_01JC000000000000000000000A",
    occurrence_start: "2025-11-15T09:00:00",
  }),
});
const data = await response.json();

Request, HTTP

POST /api/v1/households/hh_01K9BKKP003AHRZ6DMV29GQY5C/commands/calendar.event.cancel_occurrence HTTP/1.1
Host: rigel.house
Cookie: rigel_session=<your session>
Content-Type: application/json
Idempotency-Key: cmd_01JC4N0000AAAAAAAAAAAAAAAA

{
  "event_id": "evt_01JC000000000000000000000A",
  "occurrence_start": "2025-11-15T09:00:00"
}

Response, 200

HTTP/1.1 200 OK
Content-Type: application/json
X-Request-Id: req_01K9D9S2R0XHKMV1M5RR1DFTH4

{
  "result": {},
  "version": 1
}

Cancelling the occurrence that has a pending reminder withdraws it and schedules the next one

Request, curl

curl -X POST 'https://rigel.house/api/v1/households/hh_01K9BKKP003AHRZ6DMV29GQY5C/commands/calendar.event.cancel_occurrence' \
  -H "Cookie: rigel_session=$RIGEL_SESSION" \
  -H 'Content-Type: application/json' \
  -H 'Idempotency-Key: cmd_01JC4N0000AAAAAAAAAAAAAAAA' \
  -d '{
  "event_id": "evt_01JC000000000000000000000A",
  "occurrence_start": "2025-11-15T09:00:00"
}'

Request, TypeScript

const response = await fetch("https://rigel.house/api/v1/households/hh_01K9BKKP003AHRZ6DMV29GQY5C/commands/calendar.event.cancel_occurrence", {
  method: "POST",
  headers: {
    "Content-Type": "application/json",
    "Idempotency-Key": "cmd_01JC4N0000AAAAAAAAAAAAAAAA",
    Cookie: `rigel_session=${process.env.RIGEL_SESSION}`,
  },
  body: JSON.stringify({
    event_id: "evt_01JC000000000000000000000A",
    occurrence_start: "2025-11-15T09:00:00",
  }),
});
const data = await response.json();

Request, HTTP

POST /api/v1/households/hh_01K9BKKP003AHRZ6DMV29GQY5C/commands/calendar.event.cancel_occurrence HTTP/1.1
Host: rigel.house
Cookie: rigel_session=<your session>
Content-Type: application/json
Idempotency-Key: cmd_01JC4N0000AAAAAAAAAAAAAAAA

{
  "event_id": "evt_01JC000000000000000000000A",
  "occurrence_start": "2025-11-15T09:00:00"
}

Response, 200

HTTP/1.1 200 OK
Content-Type: application/json
X-Request-Id: req_01K9HXZGJ0KPE6BE53JRGTC12F

{
  "result": {},
  "version": 1
}

A day the rule doesn't reach isn't an occurrence

Request, curl

curl -X POST 'https://rigel.house/api/v1/households/hh_01K9BKKP003AHRZ6DMV29GQY5C/commands/calendar.event.cancel_occurrence' \
  -H "Cookie: rigel_session=$RIGEL_SESSION" \
  -H 'Content-Type: application/json' \
  -H 'Idempotency-Key: cmd_01JC4N0000AAAAAAAAAAAAAAAA' \
  -d '{
  "event_id": "evt_01JC000000000000000000000A",
  "occurrence_start": "2025-11-14T09:00"
}'

Request, TypeScript

const response = await fetch("https://rigel.house/api/v1/households/hh_01K9BKKP003AHRZ6DMV29GQY5C/commands/calendar.event.cancel_occurrence", {
  method: "POST",
  headers: {
    "Content-Type": "application/json",
    "Idempotency-Key": "cmd_01JC4N0000AAAAAAAAAAAAAAAA",
    Cookie: `rigel_session=${process.env.RIGEL_SESSION}`,
  },
  body: JSON.stringify({
    event_id: "evt_01JC000000000000000000000A",
    occurrence_start: "2025-11-14T09:00",
  }),
});
const data = await response.json();

Request, HTTP

POST /api/v1/households/hh_01K9BKKP003AHRZ6DMV29GQY5C/commands/calendar.event.cancel_occurrence HTTP/1.1
Host: rigel.house
Cookie: rigel_session=<your session>
Content-Type: application/json
Idempotency-Key: cmd_01JC4N0000AAAAAAAAAAAAAAAA

{
  "event_id": "evt_01JC000000000000000000000A",
  "occurrence_start": "2025-11-14T09:00"
}

Response, 404

HTTP/1.1 404 Not Found
Content-Type: application/json
X-Request-Id: req_01K9D9S2R035ZVTN1ETPVCZVXT

{
  "error": {
    "code": "occurrence_not_found",
    "message": "The event doesn't happen at 2025-11-14T09:00:00. No changes were applied.",
    "details": {
      "occurrence_start": "2025-11-14T09:00:00"
    },
    "recovery": "Read the current state, then send a command that fits it.",
    "request_id": "req_01K9D9S2R035ZVTN1ETPVCZVXT"
  }
}

An all-day key doesn't fit a timed event

Request, curl

curl -X POST 'https://rigel.house/api/v1/households/hh_01K9BKKP003AHRZ6DMV29GQY5C/commands/calendar.event.cancel_occurrence' \
  -H "Cookie: rigel_session=$RIGEL_SESSION" \
  -H 'Content-Type: application/json' \
  -H 'Idempotency-Key: cmd_01JC4N0000AAAAAAAAAAAAAAAA' \
  -d '{
  "event_id": "evt_01JC000000000000000000000A",
  "occurrence_start": "2025-11-15"
}'

Request, TypeScript

const response = await fetch("https://rigel.house/api/v1/households/hh_01K9BKKP003AHRZ6DMV29GQY5C/commands/calendar.event.cancel_occurrence", {
  method: "POST",
  headers: {
    "Content-Type": "application/json",
    "Idempotency-Key": "cmd_01JC4N0000AAAAAAAAAAAAAAAA",
    Cookie: `rigel_session=${process.env.RIGEL_SESSION}`,
  },
  body: JSON.stringify({
    event_id: "evt_01JC000000000000000000000A",
    occurrence_start: "2025-11-15",
  }),
});
const data = await response.json();

Request, HTTP

POST /api/v1/households/hh_01K9BKKP003AHRZ6DMV29GQY5C/commands/calendar.event.cancel_occurrence HTTP/1.1
Host: rigel.house
Cookie: rigel_session=<your session>
Content-Type: application/json
Idempotency-Key: cmd_01JC4N0000AAAAAAAAAAAAAAAA

{
  "event_id": "evt_01JC000000000000000000000A",
  "occurrence_start": "2025-11-15"
}

Response, 404

HTTP/1.1 404 Not Found
Content-Type: application/json
X-Request-Id: req_01K9D9S2R098K869FZMSC5F6W9

{
  "error": {
    "code": "occurrence_not_found",
    "message": "This event has a start time, so name the occurrence by its date and time, such as 2026-11-14T09:00. No changes were applied.",
    "details": {
      "occurrence_start": "2025-11-15"
    },
    "recovery": "Read the current state, then send a command that fits it.",
    "request_id": "req_01K9D9S2R098K869FZMSC5F6W9"
  }
}

An event that doesn't repeat can't have one occurrence cancelled

Request, curl

curl -X POST 'https://rigel.house/api/v1/households/hh_01K9BKKP003AHRZ6DMV29GQY5C/commands/calendar.event.cancel_occurrence' \
  -H "Cookie: rigel_session=$RIGEL_SESSION" \
  -H 'Content-Type: application/json' \
  -H 'Idempotency-Key: cmd_01JC4N0000AAAAAAAAAAAAAAAA' \
  -d '{
  "event_id": "evt_01JC000000000000000000000B",
  "occurrence_start": "2025-11-11T15:30"
}'

Request, TypeScript

const response = await fetch("https://rigel.house/api/v1/households/hh_01K9BKKP003AHRZ6DMV29GQY5C/commands/calendar.event.cancel_occurrence", {
  method: "POST",
  headers: {
    "Content-Type": "application/json",
    "Idempotency-Key": "cmd_01JC4N0000AAAAAAAAAAAAAAAA",
    Cookie: `rigel_session=${process.env.RIGEL_SESSION}`,
  },
  body: JSON.stringify({
    event_id: "evt_01JC000000000000000000000B",
    occurrence_start: "2025-11-11T15:30",
  }),
});
const data = await response.json();

Request, HTTP

POST /api/v1/households/hh_01K9BKKP003AHRZ6DMV29GQY5C/commands/calendar.event.cancel_occurrence HTTP/1.1
Host: rigel.house
Cookie: rigel_session=<your session>
Content-Type: application/json
Idempotency-Key: cmd_01JC4N0000AAAAAAAAAAAAAAAA

{
  "event_id": "evt_01JC000000000000000000000B",
  "occurrence_start": "2025-11-11T15:30"
}

Response, 404

HTTP/1.1 404 Not Found
Content-Type: application/json
X-Request-Id: req_01K9D9S2R0F20GSKS9VH7DG1WM

{
  "error": {
    "code": "occurrence_not_found",
    "message": "That event doesn't repeat, so it has no separate occurrences. Change the event itself. No changes were applied.",
    "details": {
      "occurrence_start": "2025-11-11T15:30:00"
    },
    "recovery": "Read the current state, then send a command that fits it.",
    "request_id": "req_01K9D9S2R0F20GSKS9VH7DG1WM"
  }
}

An event another app owns is refused

Request, curl

curl -X POST 'https://rigel.house/api/v1/households/hh_01K9BKKP003AHRZ6DMV29GQY5C/commands/calendar.event.cancel_occurrence' \
  -H "Cookie: rigel_session=$RIGEL_SESSION" \
  -H 'Content-Type: application/json' \
  -H 'Idempotency-Key: cmd_01JC4N0000AAAAAAAAAAAAAAAA' \
  -d '{
  "event_id": "evt_01JC000000000000000000000D",
  "occurrence_start": "2025-11-21T09:00"
}'

Request, TypeScript

const response = await fetch("https://rigel.house/api/v1/households/hh_01K9BKKP003AHRZ6DMV29GQY5C/commands/calendar.event.cancel_occurrence", {
  method: "POST",
  headers: {
    "Content-Type": "application/json",
    "Idempotency-Key": "cmd_01JC4N0000AAAAAAAAAAAAAAAA",
    Cookie: `rigel_session=${process.env.RIGEL_SESSION}`,
  },
  body: JSON.stringify({
    event_id: "evt_01JC000000000000000000000D",
    occurrence_start: "2025-11-21T09:00",
  }),
});
const data = await response.json();

Request, HTTP

POST /api/v1/households/hh_01K9BKKP003AHRZ6DMV29GQY5C/commands/calendar.event.cancel_occurrence HTTP/1.1
Host: rigel.house
Cookie: rigel_session=<your session>
Content-Type: application/json
Idempotency-Key: cmd_01JC4N0000AAAAAAAAAAAAAAAA

{
  "event_id": "evt_01JC000000000000000000000D",
  "occurrence_start": "2025-11-21T09:00"
}

Response, 409

HTTP/1.1 409 Conflict
Content-Type: application/json
X-Request-Id: req_01K9D9S2R0B2QWKC7102722VSS

{
  "error": {
    "code": "event_owned_by_app",
    "message": "Maintenance manages this event. Change it there. No changes were applied.",
    "details": {
      "app": "maintenance"
    },
    "recovery": "Read the current state, then send a command that fits it.",
    "request_id": "req_01K9D9S2R0B2QWKC7102722VSS"
  }
}

The event must exist

Request, curl

curl -X POST 'https://rigel.house/api/v1/households/hh_01K9BKKP003AHRZ6DMV29GQY5C/commands/calendar.event.cancel_occurrence' \
  -H "Cookie: rigel_session=$RIGEL_SESSION" \
  -H 'Content-Type: application/json' \
  -H 'Idempotency-Key: cmd_01JC4N0000AAAAAAAAAAAAAAAA' \
  -d '{
  "event_id": "evt_01JC000000000000000000000Z",
  "occurrence_start": "2025-11-15T09:00:00"
}'

Request, TypeScript

const response = await fetch("https://rigel.house/api/v1/households/hh_01K9BKKP003AHRZ6DMV29GQY5C/commands/calendar.event.cancel_occurrence", {
  method: "POST",
  headers: {
    "Content-Type": "application/json",
    "Idempotency-Key": "cmd_01JC4N0000AAAAAAAAAAAAAAAA",
    Cookie: `rigel_session=${process.env.RIGEL_SESSION}`,
  },
  body: JSON.stringify({
    event_id: "evt_01JC000000000000000000000Z",
    occurrence_start: "2025-11-15T09:00:00",
  }),
});
const data = await response.json();

Request, HTTP

POST /api/v1/households/hh_01K9BKKP003AHRZ6DMV29GQY5C/commands/calendar.event.cancel_occurrence HTTP/1.1
Host: rigel.house
Cookie: rigel_session=<your session>
Content-Type: application/json
Idempotency-Key: cmd_01JC4N0000AAAAAAAAAAAAAAAA

{
  "event_id": "evt_01JC000000000000000000000Z",
  "occurrence_start": "2025-11-15T09:00:00"
}

Response, 404

HTTP/1.1 404 Not Found
Content-Type: application/json
X-Request-Id: req_01K9D9S2R03X0KZK1CC6CBYTYP

{
  "error": {
    "code": "event_not_found",
    "message": "That event isn't on the calendar any more. No changes were applied.",
    "details": {
      "event_id": "evt_01JC000000000000000000000Z"
    },
    "recovery": "Read the current state, then send a command that fits it.",
    "request_id": "req_01K9D9S2R03X0KZK1CC6CBYTYP"
  }
}

Skip one occurrence

For "not this week", without touching the rest.

Request, curl

curl -X POST 'https://rigel.house/api/v1/households/hh_01M6V9CS6GGVFCY7NAS8ZTQV95/commands/calendar.event.cancel_occurrence' \
  -H "Cookie: rigel_session=$RIGEL_SESSION" \
  -H 'Content-Type: application/json' \
  -H 'Idempotency-Key: cmd_01M6V9CSK1B6FGS2RT090251T0' \
  -d '{
  "event_id": "evt_01M6V9CSHPG77MMGGKHAEJQ484",
  "occurrence_start": "2026-11-24T17:00"
}'

Request, TypeScript

const response = await fetch("https://rigel.house/api/v1/households/hh_01M6V9CS6GGVFCY7NAS8ZTQV95/commands/calendar.event.cancel_occurrence", {
  method: "POST",
  headers: {
    "Content-Type": "application/json",
    "Idempotency-Key": "cmd_01M6V9CSK1B6FGS2RT090251T0",
    Cookie: `rigel_session=${process.env.RIGEL_SESSION}`,
  },
  body: JSON.stringify({
    event_id: "evt_01M6V9CSHPG77MMGGKHAEJQ484",
    occurrence_start: "2026-11-24T17:00",
  }),
});
const data = await response.json();

Request, HTTP

POST /api/v1/households/hh_01M6V9CS6GGVFCY7NAS8ZTQV95/commands/calendar.event.cancel_occurrence HTTP/1.1
Host: rigel.house
Cookie: rigel_session=<your session>
Content-Type: application/json
Idempotency-Key: cmd_01M6V9CSK1B6FGS2RT090251T0

{
  "event_id": "evt_01M6V9CSHPG77MMGGKHAEJQ484",
  "occurrence_start": "2026-11-24T17:00"
}

Response, 200

HTTP/1.1 200 OK
Content-Type: application/json
X-Request-Id: req_01M6V9CSK2X313AZD1SPYJ1P9X

{
  "result": {},
  "version": 95
}

For Rigel#

Rigel's tool for this command is calendar_event_cancel_occurrence. Rigel runs this on its own, then says what it did. The agent guide has the rest.