1st East Coast Homophiles Organization conference - Philadelphia

The first conference of East Coast Homophile Organizations provided a sounding board and conferencing platform for the increasingly radically militant Mattachine Society of Washington, NY Mattachine and Philadelphia Daughters of Bilitis. In 1964, the Mattachine Society of Washington hosted the conference in Washington, DC after scrambling to find a hotel to accommodate the group.

http://www.rainbowhistory.org/echo1964.pdf