UpperCanadian said(And no, not every Pride celebration is held around the date of those riots.)
We're having an area Pride Fest in March, to avoid the Florida Summer heat. There'll be another one in Wilton Manors in the traditional June time frame, haven't heard if they'll try to do it as a nighttime event, as we had one year, again because of the brutal heat & sun.
Most US Prides are in June, and a great many of those in Canada are, as well. I commend your Canadian pride about Pride, and the greater advances you've made there than here. Still, I would contend that Stonewall got the ball rolling, even if the US has dropped it and fallen behind other parts of the world, including Canada.
Oddly, I was in Manhattan during those very days, in midtown shopping for things I'd need for my voluntary Army enlistment, scheduled for a week later. I had no idea what was going on until I returned home and read the newspapers and saw the TV news from New York. I didn't realize I was gay myself yet, but I've always hated police brutality (despite a later career in military law enforcement), and was sympathetic to the gays being beaten & arrested.
As for the Mafia ownership, my partner tells me that most of the gay bars where he went in Boston were also mob-owned. A gay bar wasn't reputable, little better than a brothel, and was frequently raided by the police for "vice" violations, and for purposes of simple harassment. The Mafia was the best at paying-off the police, and at ownership of such forbidden establishments.
My older partner tells me how the police would make drag queens provide proof that they were going to appear at an actual stage performance, which was legal, and to raise their dresses on the sidewalk to show they were wearing men's underwear and not women's, which was illegal at all times. I understood that formed part of the reason for the police raid on Stonewall, not alcohol.
Men could not legally dance with other men in gay bars & clubs, so guys would bring women "dates" with them, perhaps the origin of the fag-hag relationship with gay men. When a police raid happened, the gays on the dance floor grabbed their female escorts to avoid arrest, or appeared to be sitting with them at tables and the bar. But if the police caught 2 guys dancing together, they were arrested on public morals charges.
This is what spurred the Stonewall Riots, over several days, and why it's such an important event, at least in the US. And it pleases me that what the police thought they were suppressing was in fact spread throughout the US because of their Gestapo actions. Unintended consequences can be so unpredictable, especially when it comes to imposing moral judgment on others.