When I was organizing events, one municipality-owned site required $1M of "PL
PD," which is personal liability and property damage. Cities and other governments
have deep pockets; they want to be names as "additional insured" on the
certificate. Seems like the coverage was $40/year at the time.
CDSS used to offer caller insurance, membership required, and coverage was extra (through
Callerlab). Turn-time was not speedy. A couple of years ago the local dance society found
that the National Folk Assn coverage met venue requirements at a much lower price.
To find an insurer, just do a search on "special event insurance" and your
city/state or province. Your local or personal agent can write the policy. There are
underwriters for all kinds of activities and events (bungie jumps, beer festivals, Civil
War re-enactments) and an open, public contra dance is well within these confines. The
price is easily covered by a few people's admission fees.
HTH
--Karen D.
in the grand and glorious state of Michigan