The first day of the Grand Prix of Trois-Rivières will be held on August 5, 2017, under the powerful spotlights of the National Rallycross cars of the Challenge Extreme Elite. The GP3R unveils its new Discovery Night to introduce the general public to the discipline of Rallycross at no cost, during which the Elka Superquads will also launch for the first time in 50 years of history on the Trifluvian Circuit .