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iCalendar Recurrence Problems and Recommendations
6. Best Practices

6.1. When should the `SEQUENCE` value change?

6.1.1.Clause6.1.1The SEQUENCE value should be changed when the date, time, or duration of one or more instances, of the master instance, change. This refers to a scheduling time change, say a meeting that was from 1pm to 2pm is being rescheduled to 3pm to 4pm.
6.1.2.Clause6.1.2The SEQUENCE value should not be changed when the only properties that are changed are those not having to do with meeting date, time, or duration change. This refers to changing SUMMARY