I found out yesterday that as of june first there are a bunch of new fire regulations on dance halls. This is what I think bida needs to do:

• designate a trained crowd manager for each 250 people the hall is allowed to hold, rounded up.
• complete a checklist before each dance starts letting people in (failures on the checklist must delay the dance until they are remedied). We need to keep completed checklists in the building for a year.
• Make exit announcements at the start of the dance.
• Designate someone to make sure the hall doesn't go over capacity.

I just completed the online training to become a certified crowd manager. It took about 30min and was pretty easy. I now have a certificate and my certificate number is AzhH0bF6Us.

You can read an faq or the law. I believe these regulations apply to all massachusetts contra dances except ones held in halls certified for fewer than 100 people, but I'm not a lawyer.