Event venue in Calgary- kind of

Weird post. But I’m looking at hosting a get together for collectors within my interest (sounds sketchy but it’s not) people are down to attend such an event and travel from Lethbridge, Edmonton, Grand Prairie, etc so I want to make it worth while. Originally I was going to rent a room at Coop and such, but the event might actually be getting a bigger turn out than expected. So I was wondering what kind of meet up- hall kind of space is available in Calgary for cheap or free. The minimum at the current location is 50 people and 10 tables, so I’m looking for a big bigger than that. Thanks.