Updates an event's information using the unit21_id.

Updating an event has no required fields. You MAY send any subset of the fields that the entities/create endpoint accepts.

This endpoint requires the unit21_id which is a unique ID created by Unit21 when the event is first created.

The response will consist of the following fields:

event_idStringUnique identifier of the event on your platform
unit21_idStringInternal ID of the event within Unit21's system
previously_existedBooleanIf event (with the same event_id) already exists

Note that you can also update an event using an upsert through /events/create.

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