Just got back from the race, it was definitely an experience.
Was the first race I'd been to and I really enjoyed it, not only for the "race" but for the many angry Americans around me
Thankfully we hadn't paid for our tickets and we're in Indianapolis for the summer, but there were a lot of europeans there who I imagine had paid £0000s to come to Indy for the race especially.
There was a bit of talk about what would happen with the situtation due to the tyres before the race, but nobody seemed to know exactly what would happen.
When the other drivers started to pull in there was an uproar, people were throwing onto the track, booing, swearing, etc and loads of people were leaving all the time between the star of the race and the end. They sent more security people into the stands and quite a few people started to get thrown out for throwing bottles onto the track, although I didn't see anything actually get onto the parts of the track being used by the drivers.
There was a lot of talk of the guy who owns the speedway (can't remember his name) refusing to do another US GP although I presume this was just talk.
I didn't see anyone making violent protests, but the commentators (who were pretty much silent throughout the race) kept on appealing to supporters throughout to calm down and not take out their anger on each other.
Was a great day out though and very interesting to see all the "disgruntled" fans, having never seen an F1 race in person however I was quite shocked to see the amount of ferrari fans all dressed up in merchandise, yet there were only a handful of renault fans and I didn't see any other people dressed up as much for a particular team.
Coming out, there seemed to be a lot more police than going in, I think they're really expecting some trouble of some sort, and I imagine there may will be downtown tonight when all the fans get together.