That's often how unconference formats work for at least part of the day. Unconferences seem to have fallen a bit out of fashion although AFAIK DevOps Days typically combine some curated main stage talks with smaller unconference facilitated discussions. I haven't been to one for a while though.
I've been to the last couple of London DevOpsDays and find the presentations often interesting, but the ad hoc sessions in the afternoon can be some of the best parts.
