I concur with SheFly. Don't stop until they stop you or if they mention it upfront. What they do over here is to let you continue (no matter how much times you get lapped) and with just 3 laps to go they pull you out of the race by mentioning it at the passing of the starting line.

They don't group races without mentioning upfront. They prefer to cancel the race when not enough racers participate, which is also a bummer.

I hope to ride my first crit on the 21st as long as my license arrives in time (they say it should be there around the 18th). So I am already looking forward to that.