I just booked a place that sleeps 6 people. My GF & I will go but there are 2 extra beds. PM me if you're interested. It's away from Montreal north of where Eurokracy is taking place but since I prefer woods to the city, I figured we can have a fire, enjoy some beers, etc. Staying Friday - Sunday.
Price was $65 a night w/ tax. I think it's a tiny bit extra for 2-4 more people. there is air-mattress space as well.