Publish, request, and cancel

Event Method decides which calendar file is attached.

Event Method	File	What the recipient gets
Publish	event.ics with METHOD:PUBLISH	An event to add. There is no guest list. Use this for a class, a shift, or a visit.
Request	invite.ics with METHOD:REQUEST	A meeting invitation that asks attendees to respond.
Cancel	cancel.ics with METHOD:CANCEL	A request to remove the event you sent before.

Publish is the default. If you choose Request and leave attendee addresses blank, the action uses the To recipients. If Request has no guest addresses at all, the file is sent as Publish instead.

Cancel the same event

Send the action again with:

1. Event Method Cancel.
2. The Event UID you stored from the first send.
3. An Event Sequence higher than the previous send for that UID.

A new Event UID creates a second event. It does not remove the first one.