Quebec City on June 14th. It will do a 135km loop but we do not know the map yet. Should come out in February the site says.

You have to register for it and it is $300cdn. Limited space. Last I've heard, they were nearing 2000 cyclists, and the max is 4000. All those cyclists will meet a group of 1000 who are doing a 1000km stretch (but those you can't enter - long story short, it is by draw and teams and they need to raise x amount of money per person in the team). You also have to get all your stuff (jerseys, tags, etc. the day before the event) and be on start line at 7:30am the day of the Challenge.

Sorry, don't have the link in English.