You didn't really say what the skill level of the group is. When I retired, I used the company funds alloted to a retirement party to take everyone bowling (only 40 people though). The house put on a private "color-rama". (not sure if it's called the same thing everywhere). The skill level was varied, but everyone had a good time. Actually, the skill level was pretty low--toward the end of the three games, we were paying even if the bowler got a spare on the colored pins.