A Rush concert is a lot like a hockey game. I'll translate into your units and terms.
If you go to a hockey game in the upper deck, everyone comes to their seats having bought two liters of beer. They drink these in the hour it takes to play a period, they all go to the bogs during intermission, they buy two more liters of beer, and they watch the second period. Repeat before the third.
A Rush concert is just like this, except there's only the one intermission and a lot more of them show up already drunk. There was a guy already passed out outside the venue in St. Louis.
If you blaspheme against their gods while they're lit, Lord knows what they would do. As Brian Posehn pointed out, there is no rage like nerd rage.