Have Some Cake
Looking for an excuse to have some cake? I think Shakepeare's birthday is a good enough reason to have a celebration. Cakes, balloon animals (you know he would love balloon animals), and depending on how many people you have, you could act out a scene from a play or read your favorite sonnets. So many possibilities! If I had photo editing software I'd add a party hat onto his head. It would be green with pink polka dots. It might make him smile.