You are very lucky racers getting on the same card as BSB, well done Chris. Even if you have to wait all day and half the crowd have gone home, it will still be a big day and you will get to watch the races as well. Suspect you'll be in the outer paddock, but wonder if you will have pitlane passes as usual so you can get close up?
I recall racing at Castle Coombe with BSB riders there and a big crowd -what a difference, it was brilliant to have so many people watching.
If you do go out before them, make sure your sump plug etc is tight
WeeJohnyB