I put my mind to figuring out what was needed. What we had to have was some practice using Defence spells, which meant starting a club. At Hogwarts, there are lots of clubs, associations and what-not...the foreign-born students have one, there's one for people who really, really like Charms, another for Gobstone collectors, and so on. With all that, a "study group" couldn't attract much attention, I figured. More fool I.