I am from a very big family and we would all end up at my mom and dad's for Thanksgiving and at my aunt and uncle house on Christmas. We would usually get about 50 to 60 guests. It was great because people would show up that you have not seen since last Thangsgiving or Christmas.
My favorite ritual involved each guest bringing a gift all wraped up to put under my aunts tree. After dinner, we would all pick a number out of a hat. After dessert, we would all gather around the tree and the person with the number "1" would pick a present and unwrap it. This would be his or her gift. The person with the number "2" would then open a present, and would have a choice of keeping his gift or trade his gift with number "1". If he wanted number "1's" gift, number "1" had to trade. Then number "3" would get a turn, and if he liked his gift, fine. If not, he could force a trade from either number "1" or number "2". This went on and on until the last person unwraped his gift. If he was number "60" for instance, he can keep his gift or trade it for any of the other of the 59 gifts in the room. At the end, we took a vote to see if number "1" was allowed to be able to force a trade since he or she was not able to trade because of having the only available gift at the time.
What made this so fun was because sometimes new people would show up (a cousins new girlfriend maybe, or a relatives co-worker being invited) and if their gift is not so good, would they take a really good gift from your sweet grandma or grandpa. Or who is gonna make brownie points for forcing their good gift on a favorite aunt, in exchange for her crappy gift. Also, who was bickering with someone during the year and is able to get revenge by giving "him" your epilady, or giving "her" the adjustable wrench set you just unwraped.
This went on for hours and we would all try to bring friends with gifts with us to add to the excitement. It got so big that we got to the point that we had to start eating Christmas dinner at 1:00 in the afternoon, so the game could end before midnight!!!
Matty in Brooklyn