Visible crew/equipment: Early in the the film, after the attack in a shot with police tape in view, you can see a camera on a dolly along with the focus puller in the left side of the shot (wide screen version). (00:11:55)
Visible crew/equipment: As the crossing guard moves out of the way and the van resumes chasing Kathy's Porsche, a dolly of equipment is visible on the grass on the left. There is no dolly present in the scenes preceding it that show the area. (00:44:45)
Answer: The movie never clearly says. It was some event that required tickets, as the mom runs back into the house to get them. And it was something Sally really wanted to go to, but it is never clear what the event was.