Who is planning to celebrate? What are you planning to do? If you live or plan to visit the UK during this, are you going to the festival in Nottinghamshire?
I'm mostly planning on watching Robin Hood movies and television shows, make a themed dinner, and bake bird cookies. I'm going to either make an English beef roast with vegetables or braised rabbit if I can find it. The cookies will be blue birds with little stars for Robin's bird friend. I might make a cake for the hell of it. I will make homemade bread for the dinner.
I'll post pictures of dinner/shrine set up and offering, once it happens.