The Electric Daisy Carnival drew 130,000 young people to Las Vegas on its final day last year. This summer, Billy Joel will sell out his 43rd concert at Madison Square Garden, where floor tickets sell in the $200 range. No matter the age or inclination, people still want to leave the house and be with other people. They just need a really good reason to do so. Here are 10 retail centers that have some of the best reasons: