Something happening for the brand on a known date, such as a sale, launch, or holiday, with an agenda of typed items that give it behavior. The Commerce Agent reads MARKETING events near the current date as context, both when it answers shoppers and when it writes outbound marketing messages, and may repeat what they say to shoppers.
The typed items attached to this event, in order. A kind this API version does not model is returned as CalendarUnknownAgendaItem. Change them with agendaOperations on updateCalendarEvent.