I went to Bristol for Friday only and ended up staying and watching all three days. Typical Bristol track, it will hold low et with one pair and two pairs later everyone is smoking the tires, and then back to low ets.
Lots of seats on the premises, many were empty but there were a lot of people lining the fences where they could. Many people watch from their motor homes that are parked on the hills and have a view of the track.
The place is clean (they even have personnel going around sweeping up the cigarette butts), spacious, with friendly personnel. I got to watch 3 rounds from Bruton's suite and that was great.