The first pride parades were actually held on June 28, 1970, the first anniversary of the brutal police raids of Stonewall Inn in the Greenwich Village. The date is important, as is the reason for the march, and it is the reason the June is Pride Month. Gay people were fed up with the harassment and abuse they faced constantly, and decided it was time to be heard.

It was the moment when gay people bagan to be heard and to feel comfortable being who they are. I was hopeful we were finally through all that, but alas, the right wingers driven by the religious right and neofascist groups are trying to turn back the clock, aided by their allies in the Republican party.

https://thehill.com/homenews/state-watch/3521947-pride-month-marred-by-rising-anti-lgbtq-hate/