> ## Documentation Index
> Fetch the complete documentation index at: https://developers.redo.com/llms.txt
> Use this file to discover all available pages before exploring further.
# UpdateCalendarEventInput
> Changes to a calendar event. Omitted or null fields are unchanged, except `description`, which null clears. Field changes and `agendaOperations` apply together or not at all.
[CalendarAgendaOperationInput!]}>
Changes to the agenda, applied in order after the field changes. At most 50.
CalendarAgendaItemInput}>
Append a new item to the end of the agenda.
CalendarPromotionAgendaItemInput}>
A PROMOTION item.
CalendarAgendaItemRemoveInput}>
Remove an existing item. A promotion Redo found on the brand's homepage returns DETECTED\_PROMOTION\_NOT\_REMOVABLE, since Redo would add it again; delete the event to dismiss it.
The agenda item's `id`.
CalendarAgendaItemUpdateInput}>
Change fields on an existing item.
The agenda item's `id`.
CalendarAgendaItemInput!} required>
The fields to change, under the item's own kind key. Omitted fields are unchanged. A different kind returns AGENDA\_ITEM\_KIND\_MISMATCH.
Whether the event spans whole days in `timezone`.
Notes about the event, at most 1000 characters. The Commerce Agent reads them for MARKETING events and may repeat them to shoppers, so keep internal notes out.
DateTime}>
When the event ends. Must not be before `startAt`.
DateTime}>
When the event starts.
The IANA time zone the event is written in, such as `America/New_York`.
The name of the event, 1 to 200 characters. The Commerce Agent reads it for MARKETING events and may repeat it to shoppers.
This documentation is built and hosted on [Mintlify](https://mintlify.com), a developer documentation platform.