The sound reverberating off the amphitheatre is am...

The sound reverberating off the amphitheatre is amazing! The staff are friendly. The only real issue that I have, is that I paid for reserved seats and every time we went to the bathroom and came back, there were people standing where our seats were - some of them didn't want to leave! There is a huge difference in price between general admission and reserved seating, AND it's so easy to check tickets... the staff did it before the bands started - why not during the shows???