Here are a few ways to mark the day:

1. Make some Harry Potter-themed snacks: From butterbeer to Harry's favorite treacle tarts, you can treat co-workers, friends and family to food so good it's magical. [Get recipes here | and here]

2. Since you've made all that food, why not have some people over for a movie marathon? [Click here for the movies, in order, with trailers]

3. Prefer the books? Gather your army and find your room of requirement, then take turns reading "Harry Potter and the Scorcerer's Stone," in which Hagrid brings Harry a birthday cake. [See the full list of Harry Potter books]

4, Have you read the books and seen the movies too many times to count? Maybe you should host a Harry Potter crafts party. [make a house scarf | hold a potions class | make a golden snitch | make a flying key]

5. Play muggles quidditch: Chances are you don't own a Nimbus 2015, but that doesn't mean you can't catch a gold snitch. There are now more than 300 quidditch teams around the world you can join (or start your own team). [rules of the game]

6. Play the Harry Potter version of the board game Clue: A member of the Gryffindor house is missing. Was it Draco Malfoy in the trophy room with a vanishing cabinet? [available on amazon.com | check out the  game]

7: Visit the Wizarding World of Harry Potter: Unless Hermione has loaned you her time turner, it might be too late to do that today. There's always the weekend. [Florida's park | gallery of grand opening]