Paging @thoule for you.
I'll say out loud here that, although the event registration is full, its very rare that everyone who registered actually shows up, so its possible there may be an opening that day. Still, its up to the organizers to see if they can let you attend. I know the conference rooms at Broad Institute are large, but do have a limited amount of capacity, so it may come down to not overcrowding the room.
