Traveling from Penn. to Calif. this year fighting for a top 10 NAG spot, and then skip Grands? Hell no!!
I may be wrong, but I don't recall any restrictions on riding in the parking lot outdoors, and if I'm recalling correctly, it looks like its going to be pretty nice in Tulsa for the whole week. Maybe there should be, but I don't recall much for riding restrictions inside either.....
There's also the double point race event in Sand Springs (a Tulsa suburb) on Wednesday if you need a little pre-Grands tune-up. We went to that last year, and met a lot of people that have been making it a part of their Grand Nationals trip for years. I was surprised it wasn't super crowded, but that might have been due to the threat of severe thunderstorms that evening.
But yeah, if you haven't been racing at all since Labor Day, going to Grands does seem pretty pointless for you. Not sure why you did that with the tracks open even way up in Illinois, Wisconsin and Minnesota thru the end of October.