J.✰.
Plenty of bottles of ice-cold sparkling apple cider, white sparkling grape juice, purple sparkling grape juice. Warm cider on the stove or in the crock pot is antoher great idea. As for alcoholic drinks - you could say "BYOB. Ice and sparkling juice provided." As for me, I like Reisling wine.
I love the game "Apples to Apples" and it is kid friendly.
The game "Boxers or Briefs" is fun too, similar to Apples To Apples, but there are phrases that may not be for the kids.
You could always do a gift game with the kids. Not sure of the name, but you wrap a gift around a gift around a gift around a gift..... ie: Wrap a dvd in wrapping paper. Then place a jump rope on top of that and wrap. Then on that, place a can or two of play-doh and wrap that. So you end up with one huge package. The kids basically sit in a circle, pass the gift while music plays, then when the music stops, the child holding the gift gets to unwrap that layer and take the prize that they unwrap. Then they leave the circle and the other kids pass gift around until the music stops. Play until all children get a gift.
You could also have a few movies on for the kids if there are too many, and so that parents can take a little bit of a break. Consider perhaps hiring a teenager or two to come be 'helpers' getting kids their plates of food and making sure the kids don't wreck your house, so that parents can take it easy a little.