Man, trying to pin down a definitive list of BookTok Fest events is like herding cats because so much of it is organic and community-driven. The 'official' stuff feels less important than what readers actually buzz about.
One huge trend I've seen is themed 'sleepover' readathons that last a whole weekend, where everyone tackles a specific trope like 'morally grey love interests' or 'coastal grandmother mysteries.' The real draw isn't the schedule, it's the live-tweeting (live-Tokking?) of reactions and the collective gasps in the comments. It's chaotic and wonderful.
Also, the resurgence of quote battles is massive. Someone posts a heart-wrenching line from a recent hit, like maybe from 'The Seventh Son' or 'A Taste of Gold and Iron,' and the replies are just people dueling with their own favorite devastating quotes. Less of a formal event, more of a constant, beautiful war of words.
What's popular seems to be anything that turns reading from a solo act into a shared, immediate experience, you know?