BARBEQUE, not steak house.
Make it instructional in a fun way – train him to be great at it. Give him a chef’s hat, apron, all the implements and supplies, a barbeque, and ask the guests to bring several kinds of meat and vegetables, with recipes.
Or have a bbq’ing contest. Maybe the group can also teach him how to make potato salad.
Get one of those cheap kiddie pools (he can save it for his future kids). For anything burned or dropped, there’s a dunk in the pool.
Poker game to follow.