thanks for your comment Howard
I should say that our hall can accommodate a max of 140 people
which is fairly crowded. So I dont think its that much bigger than the hall you use. It is not likely we will find another hall that is cheaper (there was a Church that used to charge $35 until they finally figured out that it was ridiculously cheap, a Church wouldnt work as we serve beer) The $350 this Hall charges is actually a bargain in Vancouver. (In addition, the hall also expects someone to accept liability - so if we had to get event insurance that would be another couple of hundred to the cost)
Changing venues is also not a likely option since the last time we did that we lost a lot of regulars.
the 70-80 people is the minimum we need to cover costs, (usually some are kids at 1/2 price anyway)
over a season we lose money on some dances and make it up on one or two (usually the March dance is a big one). OVerall the only thing tha t keeps it going is the handfull of devoted callers and volunteers.