It seems to me like "Ask anything about Phabricator", aklapper's Sunday 11:00 UTC session, may have audience overlap with the two "main track" sessions, daniel's and lucamauri's. Should/could anything be done about that?
Topic on Talk:Wikimedia Hackathon 2021/Flow
Hello, and thanks for sharing your concern. The sessions of the main track will be recorded, which means that people who want to attend the sessions in the hacking rooms can catch up afterwards.
And the other way round, you can also always bring up questions about Phab on Talk:Phabricator/Help at any time. :)