trying to find an all inclusive list for the southern vancouver Island area too. Times/Colonist is a good source as twice a year they put out an Island Event pull out but I don't know when the Spring Summer is due to come out and I can't find it online yet.
Here are some I know of
Check the events pages of the Rec Centers ie: Pearkes Arena, Commonwealth Pool
Check the municipality webpages. I know Oak Bay, Sidney have weekly summer markets.
Saanich Fairgrounds has a summer market & craft fairs
Summer Markets that I know of
Goldstream Station Market they close Bren Mauer Rd on Saturday from 10am - 3pm
Moss Street Market
James Bay Market
Government Street Market (now held in Centennial Square) this is by Chinatown
Bastion Square Market
Inner Harbour Night Market
Victoria Flea Market and Craft Fair at the Da Vinci Center thru the winter
Langford Legion has craft fairs now and again
Winter market in Langford as well
if you just do a Google search under the names you should find them.
Also check the events spots of Craigs List, Used Victoria & Kijiji
Oh and Western Speedway thru the summer has flea market,crafter you name it market on Sundays thru the summer not sure when it starts. It's an early start event you have to get there by around 6am to get a spot and it's first come first served.
Buccaneer Days held June 9th & 10th this year has a crafters market inside the curling rink. Still tables available however jewerly quota has been filled (waitlist tho). to contact the organizer email to firstname.lastname@example.org
That's all I know. Good luck and if you find others please let me know. Cheers everyone happy crafting.