You don't need anything like that dark.
These days are quite fun - but totally different to a normal sprint day. We went once and I swear there was at least 50 cars out on the track at once. My record for the day was overtaking 16 cars in 1 lap.
But there is no timing and it is very crowded out there. Also note - in the passenger sessions you can not go out onto the track unless you have a passenger.