I am going to Azusa tomorrow (9/27). I will get there around 9am. I have a silver FJ completely stock without a roof rack. If you go and see me, please say hi.
I have been there many times and it is very very fun. So many options of water, rocks, hill climbs, decents, mud, deep sand, deep gravel and stuff you wouldn't even think of trying, lol.
The Rangers are currently limitting to the first 250 off-road vehicles. They won't reach the limit on a Saturday but on Sunday they do by 10:00am.