On July 1, filmmakers of the next Harry Potter movie, Harry Potter and the Half-Blood Prince, will begin their search for a girl to play the role of Lavender Brown, the "sycophantic drama queen who becomes Ron Weasley's first girlfriend."
One week later on July 8, they'll again hold a casting call to find their Tom Riddle, who "grows up to be the evil dark wizard Lord Voldemort." Eligible hopefuls must be between the ages of 15 and 18, and must be residents of Britain (and they are required to present identification at the casting call).
Apparently, when they last did this to find the actresses to play Luna Lovegood and Cho Chang, 15,000 girls showed up to vie for the spots. So if you're going, bring a chair. And good luck!