There's an active sailing club in Sylvan Lake - we race
every Wednesday, about 15-20 keelboats, 21-24 feet. We host races on the weekends too, though they are not as well attended.
You can just show up on the docks on Wednesdays 5:30pm to find a place. I don't think anyone has been turned away. Races are canceled if there's zero wind
or too much wind (so we have had people drive up from Calgary, and didn't get to go out as a result, c'est la vie). Or you can contact the executive for something more formal.
PM me for more details if you like or visit https://www.sylvansailing.ca/