Yes definitely..they seemed very worried about not having enough people and were going up and down the line telling everyone to tell as many people as they could to show up and that they need not sign up. Heck even yesterday they werent checking anything.
There were probably 500 or so people to start but the number dwindled quickly as a majority of the people only rode a couple times. They said yesterday that their goal was to run 25 cycles on each train, so 50 total. They started at about 5:15 and ended about 7:45. Most people got in about 8 or 9 rides, a few got more by doing rerides (essentially as single rider fill-ins) toward the end.
Interesting, so can we just show up anytime between 5-8 (not necessarily at 4:30)? That would make it a lot easier for me to get down there from SF, I'm hoping to duck out of work early tomorrow to make it!