Last one I went to was Rage Against the Machine at the Target Center when the RNC was in town. AWESOME show! Crowd was totally pumped and into it. The energy unbelievable! I was still bobbing my head to what I remembered hearing a few days later still.
It took a while for my hearing to fully regain my hearing afterwards.
As the RNC was going on in town, the security outside the arena was beefed up, and there was a huge contingent of cops in riot gear waiting. There was an obvious attempt at intimidation of the concert-goers. But, there was no violent incidents. There were just people arrested for blocking the street and not wanting to move.