Every Sunday in the summer, hundreds of people gather around the statue of Sir George-Étienne Cartier on Mount Royal. The assembly doesn't have an official name, but it's called the Tam-Tams by most. The focus of the event is the drum circle, a free-style jam where anyone can bring a hand-drum and start playing along; it's not unusual to see over a hundred drummers at one time. The rest come to listen to the music, dance, play some hacky sack or frisbee and just enjoy the great outdoors.
Along with the Jazz Fest (which I wrote about earlier), the Tam-Tams are part of a complete summer experience in Montreal. The event has a great vibe, Mount Royal park is beautiful, and overall it's quite possibly my favorite use of a Sunday. If you're ever in the city, do yourself a favour and check it out.