I have to admit--I kind of forget about the Marcus Amphitheater every year after Summerfest is over. I love the venue--but I feel like most concerts that are not a part of Summerfest head to Alpine Valley, the Bradley Center or one of the smaller venues like the Pabst or Riverside.
It's kind of a shame--it's a great place to see shows, expecially during the warmer summer months. You're outside, you can sometimes see the stars and also feel a breeze. Sure--sometimes you get rain--but for me--that just adds to the whole experience.
The only upcoming show I can think of is Rush, which will be on September 6. I wish there were more shows coming to the Marcus Amphitheater!