S.H.
I 2nd everybody's ideas....we do it all!
The ###-###-####pc puzzles are always a big hit..not many guests can resist helping!
I leave a stack of games & cards out. I leave food/goodies out....the buffet is a nonstop dessert bar!
AND I ALWAYS let everybody help....with everything: cooking, cleaning, laundry....I mean everything! If they offer, I accept. If I need help, I ask. It makes for One Big Happy.