IST is Irish Standard Time:
09:30 to 11:00 IST Internet Governance Public Session
14:00 to 17:30 IST ICANN Public Forum
17:30 to 18:30 IST ICANN Public Board Meeting
19:00 to 20:00 IST ICANN 54 Wrap-Up Cocktails (sorry no remote participation/video available)
Full ICANN 54 Schedule here (with links to sessions having remote participation online).
See also: ICANN 54, Dublin (Oct 18-22), schedule links, info, and twitter feeds here