C.S.
I hate to say it but I think getting 2 year olds to play just about any sort of organized game will be like herding cats- they will probably have lots of fun just playing. In an adults mind it always seems crazy to have nothing planned for them to do but at that age, I've found free play really works best. Unless maybe you want to get messy and have an area for play-doh or something like that. Have fun and Happy Birthday to your little one!