https://datatracker.ietf.org/doc/draft-ietf-calext-eventpub-extensions/19/
draft-ietf-calext-eventpub-extensions-19 - Event Publishing Extensions to iCalendar
This specification updates RFC 5545 by introducing a number of new iCalendar properties and components that are of particular use for event publishers and in...
draftietfcalextextensionsevent