The yearly summer festival whereby representatives from countries around the world come here and blow stuff up has begun. (I’m resisting the urge to say “with a bang” here)
It continues Saturdays, with Wednesday shows starting July 23, until Aug. 6.
The shows start at 10pm and last until just before 11. Best free place to watch is at the parking lot near Notre Dame and Parthenais (Papineau metro). The Jacques-Cartier bridge is also freed up during the shows, but the pedestrian area is too crowded and the roadway too obscured to be able to really enjoy it from there unless you setup really early.
Be sure to bring a chair, some slightly warmer clothes and a radio, which you can tune to 105.7 FM to listen to the music that accompanies the show (it makes a big difference). If you’re taking public transit (which you should), buy your return tickets in advance, because the lineups after the fireworks are insane.
For more information about them, check out this unofficial enthusiast’s site.