By Paul HunterXbox Canada have announced on their website that a Halo: Reach sneak peak event will be coming to Toronto on Saturday, September 4th.
Dubbed "Mission: Defend Reach" on the event page, the mission will let you become a new UNSC recruit and battle Covenant troops live using "state-of-the-art weapons technology". Not sure exactly what that entails, but sounds like you'll get to wield over-sized, fake plastic guns. The battle is taking place between 4pm and 10pm at 306 Queen Street West. I did a google street view and it appears to be a parking lot, so yeah, lots of cars to use as cover fire.
For more details on the event, check out the official page on Xbox Canada's website.