I've only photographed the carnival 4 times, usually on the Monday, though I chose the Sunday this time, it was a lot less crowded. Like any big event, one person can't be everywhere, see and photograph everything. Next year I might investigate finding somewhere close to stay for a few nights to cover more, as my train into London takes an hour in and back. I've never seen any serious wrong doing. The closest was last year when two scantily clad women were sharing a bottle of Jack Daniels on the top of a bus stop, no big deal. The police that helped them down had big grins on their faces. Ear plugs are a must. Even then you feel your body vibrating when photographing directly behind a truck and sound system. I never temp providence and pull my MacBook Pro out on the streets to edit photo's and upload. I chose a pub that had been stripped of most furniture, had to use a servery top and stand there. All quite enjoyable but can be exhausting. I find Kensal Green tube ideal to leave via.