I saw this person at the UBC Grand Prix, and wonder if it's one of our illustrious members.
It was a fun event, and my first crit race to watch. I wondered why the field got smaller as the race went on, and found out you get kicked out if you're lapped, or deemed to be "no longer in contention". The woman on the left waves a red ping-pong paddle type thing at you, and you must leave the course.
No crashes that I saw, but there was one in the Womens race. They had hay bales around the corners just in case.