Between 1979 & 2000 there were four marches. The 1st & 2nd marches were in 1979 & 1987 and each called National March on Washington for Lesbian and Gay Rights. Check out the video below to see the 1987 march.
The National March on Washington for Lesbian, Gay, and Bi Equal Rights and Liberation was a large political rally and the largest of the LGBT marches. That took place in Washington, D.C. on April 25, 1993. Organizers estimated that 1,000,000 attended the March. The D.C. Police Department put the number between 800,000 and more than 1 million, making it one of the largest protest in American history. The 1993 march organizers were also more inclusive of Queer People of Color and Bisexual people.
It wasn’t until the 2000 march that the title was changed to include and recognize Transgender people. Changing the title to the Millennium March on Washington for Lesbian, Gay, Bisexual, and Transgender Equality.
If you are interested in learning more about the history of the marches checkout “The Dividends of Dissent How Conflict and Culture Work in Lesbian and Gay Marches on Washington” by Amin Ghaziani.