I'm curious about the parking for that. That's why we've never gone. It was far easier for us to go to it when it was in Beacon Hill. My daughter took her little toddler over by bus, which is a pain in the behind. When it was time to leave they were running for the bus and even though she's pretty sure the driver saw her, he pulled away so she had to wait another 40 minutes or something.
To quote AI:
".....parking is limited for the Gorge Road Canada Day celebration. Attendees are encouraged to walk, bike, or take the bus to the event."
Which is bang on, OTOH its also true that attendees often do not mind parking whereever they can as far away as the other end of Selkirk by Banfield Park. Selkirk, McNaughton, Uganda, Gosper Crescent and a host of other streets which bisect and dead end at Gorge Rd directly such as Inex, Dysart, Inlet and Parkview essentially become their own versions of instant and haphazard parking lots.
That said transit buses that serve the area such as Gorge, Crosstown, Obed etc., are all definitely heavily utilized as well. There is no dedicated one stop shop parking area for the event.