It is, but it's kind of getting out of hand.
The GP on Saturday is really fun, but then they try to jam all the MX racing into Sunday, and last year it went really late. I spoke to some people there and suggested they run the vintage classes on Saturday after the GP and they seemed to think it was a good idea, but I see the schedule is the same this year.
You also need favorable weather for the GP on Saturday. Last year was REALLY dusty because they hadn't had enough rain. Like...REALLY REALLY dusty in the wood and grass fields.