I threw this together, including making a sorting hat, 20+ potions w/labels, signs, banners, drink labels, etc all in 4 days. You can read more, complete with tutorials, on my blog: http://rnrreviews.blogspot.com/search?q=harry+potter
Cake, of course.
What People Ate
Because it was last minute, I just did sweets, inlcuding Bloodworms, Butterscotch Pastilles, Cockroach clusters, Drooble's Cotton Candy, Licorice Wands
What People Drank
ButterBeer (Root Beer), Blood Mead (Strawberry) and Pumpkin Juice (Orange)