Our school celebrated our anniversary by having all the kids do an art project to commemorate the anniversary - then we had a family night that was like an art show to celebrate. It was a potluck event. Ahead of time we sent out an email and said if you didn't want to contribute food you could donate a few bucks towards supplies : napkins, plates, drinks etc. It was a dress up affair since it was like a gallery opening. The kids got a kick out of showing off their projects and getting dressed up. Families had a lot of fun!
