The track is open on the heads up nights just like usual, except that the gates open at 5:00 instead of 7:00. The time trial lanes are open and running between our rounds as well, and we have to be done by 10:00 anyway because of the noise limit.
If you're interested in racing on the heads up nights, you may want to try and get some practice on a pro tree. It's a lot different than the regular sportsman tree. If you're interested in racing in Drag Radial especially I would also recomend getting some class legal tires to practice with. Both dan and Jeff were pulling ~1.6-1.7 60' times on the little tires which tells me that even as small as they are they would be better than any normal street tire.