What are some games or activities we could do at a 70th birthday party? There will be about 30-40 guests, in a rented hall.

It's my FILs birthday and they've put ME in charge of games because they said I always have fun games when our family gets together--but those are small gatherings of 10-15 ppl. I have no ideas for a larger gathering. It will be a mixed age group--a lot of seniors, but also families with children and babies.

Help?

I'm thinking baby shower type games, adapted to fit a 70th birthday.