Show started off great, good attendance, plenty of activity. Then at 1:15 the fire alarms went off and they forced us to evacuate the bourse floor and leave the building. Boy you never saw such a slow evacuation. Took 20 minutes to get everyone out of the show floor. Surprise the dealers didn't want to leave, and leave all their coins unattended. Finally got everyone out and we spent 30 minutes outside (in a light sprinkling rain.) Finally they let us back in, and they did one smart thing. They didn't let the public back in until all the dealers were back in. (Might try doing that in reverse next time for the evacuation. Have all the public leave first and then have the dealers leave. Might get more cooperation from the dealers.)
It wasn't a drill. Heard two different stories though. Ether someone pulled the alarm as a prank, or a motor overheated and actually set off the alarm.
I've been through a fire alarm at a show before, but this was my first evacuation.