Although it's been held in August for the past few years, the Queen Alexandra Foundation car show in the Cadboro Bay area is being held in September this year. This is an open event, so not 'just' classic cars but muscle cars, street rods, etc. Spectator admission to the show is by donation and there's parking on site or the #11 bus will take you there.
If I haven't collapsed from the previous day's workshop I may even be there!
http://childrenshealthvi.org/events/vancouver-island-motor-gathering for more information.