When it inevitably comes home next weekend, where would be the best place in Toronto to watch this momentous occasion with some fellow countrymen?

This may be of use to you - you'll have to look on each pub's website to see if they are showing the Euro's - but bear in mind that it will be patio style only
https://www.livesoccertv.com/pubs/Ontario/

The same pub(s) that showed the world cup in 2018 may show the Euro's - perhaps revisit your old thread too..
Best Place in Toronto to watch the World Cup with Fellow Englishers

Here you go! https://www.queenandbeaverpub.ca/sports - Euro's on the patio - you might have to reserve a seat, so give them a bell..

You near queens quay? :O)