The only record convention occurring in Canada this weekend is the Stratford Record Show, at the Royal Canadian Legion at 804 Ontario St, in Stratford, Ontario.
It will happen on Saturday, the 3rd of June 2023, from 10am to 2pm, and admission will be $2 (which will be donated to the Legion). And I believe on demand transit services are available on that day from the city of Stratford (click here for details).
If I find another convention, i’ll add it here.
Enjoy.