As announced at the AGM here is the 2015 racing schedule, the Quebec GP is still tentative the prior weekend could become available:
Quinte TT, Shannonville Ont, June 4th-5th-6th- 7th (VRRA School on Thursday and endurance on Friday)
Summer Classic, Grand Bend Ont, July 17th-18th-19th (VRRA endurance on Friday)
Vintage Festival, CTMP Ont, August 21st-22nd-23rd (VRRA endurance on Friday)
Quebec GP, St-Eustache Ont, September 12-13th