Benjamin Olson
Hero
I was a player in a game store drop in group where we started getting 10-12 people showing up for sessions. I had to just make it an attribute of my character that he didn't really pay terribly close attention because I often had trouble hearing what was going on. Also anyone having more than 90 seconds of character time for anything was pretty rare. So I would say that having the "together" sessions cover pretty simple ground is probably best. Fights were fun with a large group. Puzzles were just a nightmare.
I have DMed for Summercamp sessions with 7 or more little kids, but the only lesson I learned there was that it's easier to just go down the initiative count each round and ask "does anyone have a 17? No... any 16s?" and such than it is to try to actually find out everyone's initiative and make a neat and tidy list.
I have DMed for Summercamp sessions with 7 or more little kids, but the only lesson I learned there was that it's easier to just go down the initiative count each round and ask "does anyone have a 17? No... any 16s?" and such than it is to try to actually find out everyone's initiative and make a neat and tidy list.