We had a 75th for my father around this time last year. Mostly it was my aunt (his sister) and I planning it. We consulted my brother, but all he really wanted to know was how much $$ he needed to send...LOL! I knew there would be a large group, so we held it at a local park in one of their shelters. We were on a lake and had plenty of room outside for people and parking. We served clams, bbq chicken, sausage, corn on the cob, several types of salads, fruit, bday cake, beer, wine, and soda. We really did manage to surprise him. As for the troublemaking relatives, they were given a choice: come and behave or stay home. Two never showed, but the rest were there. All had a very good time (and I am NEVER doing a party that big again!!!). Good luck to you...if nothing else, know that the party will be done with soon enough. Try to relax, don't try to do it all yourself, and enjoy.