The schedule is online at https://tpc20cic.sched.com/. You can edit the timezone on that page (by clicking on it) to match your timezone. Hopefully this reduces confusion.

There will be a stream of all the talks on Youtube if you can't/won't register with the conference services. This stream will also later be chopped up into the individual talks to make them available.

Joining the conference means booking via Eventbrite. The main chat avenue is Slack, but I'm sure that the usual YAPC irc channel at irc://irc.perl.org/#yapc (web client) and mirrored Telegram chat at https://t.me/perlcon will also be lively.