This probably isn't what you're looking for, but we threw a party for ourselves rather than dd. We had about 35 people over for a dinner cookout in the back yard, lasted about 4 hours, etc. There were tons of kids so we had lots of yard games, went to a field down the block for a wiffle ball game.
We hadn't had a party since buying the house 2 years ago, and welcomed the excuse to have a bunch of friends and family over. Of course, even when we have a couple of people over for lunch or dinner, they never stay for just an hour.
We sang "Happy Birthday" and people put pennies in a wishing dish with one floating candle, but other than that it was just about eating good food and having good conversations with good friends.
Happy partying, whatever you decide to do!