Who
There should be over a hundred people there. Most will identify as somewhere on the Bi+ spectrum – bisexual, bi, pansexual, pan, fluid, queer, m-spec, flexible, bi-curious, etc etc – but others will use things like lesbian / gay / straight or don't have a word for their sexual identity.
What
There will be at least two choices of what to do in any session slot – how many depends on what is offered, and how many people book to attend.
Friday evening might have 'sessions' or it might be socialising – again, it depends on what is offered.
There will also be a party on the Saturday evening and a space to socialise on the Saturday evening.