Details and tickets come from the organiser (facebook.com). Check with them before you go.
the name of the event is Diverscité Montreal, it is the first official gay pride festival in montreal that attracts over 1,5 million people over the 7 days events. the last day is full of surprises, parties, concerts and the biggest gay outside circuit party in the world with over 30000 people dancing on the same site. It's a big happening with free outside concerts every nights and parties all week long. It's also a community event as well as a gathering for arts lovers and groups discussion on different subjects about the gay community.