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iCalendar Recurrence Problems and Recommendations
6. Best Practices
6.1. When should the SEQUENCE value change?
6.2.Clause6.2If you want to reschedule the first instance, you’d send DTSTART and DTEND, RECURRENCE-ID, and UID
6.3.Clause6.3Reschedules occur in two different varieties (iTIP), rescheduling where the RECURRENCE-ID is supposed to be changed and when RECURRENCE-ID is not supposed to change.
6.4.Clause6.4When processing a RANGE that is set to THISANDFUTURE for recurrences, the order in which components have been overridden must be used to define which instances are affected by THISANDFUTURE. For example, say an event has three instances A, B and C. If B is overridden with a component with a RANGE=THISANDFUTURE