I was there for the first time this year... a buddy of mine was driving and invited a few of us for the weekend. It was memorable to say the least! I was really taken aback by the amount of effort that the teams put into the event...
The hospitality areas that some of the teams set up are just amazing... This behemoth is erected just for the race:
The teams come out weeks in advance, and start setting up shop. These sweet rubberized floors were installed by the team. They didn't like having a step in the middle of the garage, so they fabricated the diamond-plate transition you see here: