You don't really need an excuse to have a party. It can be for an event like a Birthday, Fourth of July, Weddings or whatever. You can also throw a just because party. Those spontaneous just because parties can be the most fun. One time my ex boyfriend threw a just because party and it was a small gathering. It was wonderful to get to know some of his friends on a one on one basis though. Later that week I threw him a private just because party with diapers and baby bottles, just the two of us. So party for whatever reason you wish whenever you can. Life is too short not to enjoy.