LOL, me and my friends are starting a Harry Potter club too... you can buy t-shirts on Amazon or on Ebay.
You can make butterbeer with this recipe. I heard this was the closest you'll get to the actual drink at the Harry Potter Theme Park in Orlando. Try it out, it tastes really good.
(For the drink base)
- 3/4 bottle (or 1 mug) of IBC Cream Soda
- 2 teaspoons butterscotch topping
- 1 teaspoon imitation butter flavor
(For the foam - good for 2 mugs)
- 1/3 cup Heavy Cream
- 1/4 bottle (or the remainder of) IBC Cream Soda
- 2 Tablespoons Sugar
- 1 Tablespoon Powdered Sugar
- 1 Teaspoon Vanilla Extract
How to make it:
Whip foam to desired consistency. (do not over whip unless you want really fresh butter!)
Pour Cream Soda into Butterbeer Stein or Beer Pilsner and stir in butterscotch topping and imitation butter flavor.
Layer foam on top with spoon, let rest for 10-20 seconds for the soda to carbonate the foam. (I find it helps to swirl the drink around so the soda covers the creamy foam and becomes more bubbly - also easier to drink).
You can drink the butterbeer in mugs like these: http://www.noblecollection.com/index.cfm?fa=products.product&id=NN7668&catid=21
If you buy "The Unofficial Harry Potter Cookbook: From Cauldron Cakes to Knickerbocker Glory - More Than 150 Magical Recipes for Wizards and Non-Wizards Alike" by Dinah Bucholz , you will find lots of Harry Potter recipes in there. http://www.amazon.co.uk/Unofficial-Harry-Potter-Cookbook-Knickerbocker/dp/1440503257/ref=sr_1_1?ie=UTF8&s=books&qid=1293114728&sr=8-1
You can also play "wizard's chess", if you buy these chess sets: http://www.noblecollection.com/index.cfm?fa=products.product&id=NN7979&catid=21
http://www.noblecollection.com/index.cfm?fa=products.product&id=NN7109&catid=21
Starting a Harry Potter podcast is also a good idea. And you can compose wizard rock/wrock songs. Or you can just listen to wizard wrock songs on youtube. And take HP quizzes, like Sorting Hat tests, O.W.L.s, N.E.W.T.s, W.O.M.B.A.T. exams, etc. Each club member can have their own patronus.
Write with pens like these: http://www.noblecollection.com/index.cfm?fa=products.product&id=NN7280&catid=21
You can also have houses and score house points. Or play harry potter games like "Harry Potter UNO" and "Harry Potter Scene It". Also, you can simply watch the movies and read the books together, and organise trips to the premieres, or to the cinema, or even to the Harry Potter world in Orlando. :D