Glossary
SEQUENCE
The iCalendar revision counter that tells apps an event changed and which version wins.
SEQUENCE starts at zero and increments each time the organizer revises an event. Combined with a stable UID, it lets subscribing apps apply updates in order and discard stale copies.
Publishers that edit events without bumping SEQUENCE leave subscribers guessing; some apps update anyway, others keep the old version. Correct feeds bump it on every edit.
TangoHive publishes clean ICS feeds with stable UIDs and proper timezone handling, and turns pasted schedules into shareable calendars. See how it works.