Tired of evenings out that always seem to feature those Valley standbys: flip-flops and cheap margaritas? There's no better cure than a trip to an Arizona Opera performance. It's the one of few things in town that people really do get dressed up for. And while the good seats aren't cheap the opera wants a $2,500 donation plus $121 a show just to sit in certain areas you can be frugal, with back-row tickets starting at $34 on weekdays. Even there, though, you're going to feel like a million dollars. Just leave the plastic sandals at home.