were any parades or marches organised after the aforementioned event?
Yes - on June 28, 1970 marches in Los Angeles and Chicago took place
Stonewall riots
Christopher Street Liberation Day on June 28, 1970 marked the first anniversary of the Stonewall riots with an assembly on Christopher Street; with simultaneous Gay Pride marches in Los Angeles and Chicago, these were the first Gay Pride marches in U.S. history. The next year, Gay Pride marches took place in Boston, Dallas, Milwaukee, London, Paris, West Berlin, and Stockholm. The march in New York covered 51 blocks, from Christopher Street to Central Park. 
who plays gandolf in lord of the rings Sir Ian Murray McKellen what was his debut movie? A Touch of Love can you name some of the most acclaimed stage productions he has acted in? A Scent of Flowers, Macbeth, Othello is he involved in queer activism? Yes -  LGBT rights. He is co-founder of Stonewall, an LGBT rights lobby group in the United Kingdom what is this group named after? Named after the Stonewall riots when did it happen? June 28, 1969 why? It was a series of spontaneous, violent demonstrations by members of the gay (LGBT) community in response to a police raid at the Stonewall Inn, New York City. were there any other such upheavals prior to this one? Gay, lesbian, bisexual, and transgender people staged a small riot at the Cooper Do-nuts cafe in Los Angeles in 1959 in response to police harassment.
wiki:19681476
Stonewall riots [SEP] Gay Pride
Christopher Street Liberation Day on June 28, 1970 marked the first anniversary of the Stonewall riots with an assembly on Christopher Street; with simultaneous Gay Pride marches in Los Angeles and Chicago, these were the first Gay Pride marches in U.S. history. The next year, Gay Pride marches took place in Boston, Dallas, Milwaukee, London, Paris, West Berlin, and Stockholm. The march in New York covered 51 blocks, from Christopher Street to Central Park. The march took less than half the scheduled time due to excitement, but also due to wariness about walking through the city with gay banners and signs.