The Fillmore East’s 10,000-door showing demonstrated enormous counterculture demand

Evidence

Without a hit record, and only recently broken through in San Francisco, Joplin was a sensation. Then, having used the Joplin juggernaut to announce the Fillmore’s presence, Graham closed the theater for two weeks to complete its renovation. The official opening act was the Doors, who played the night after the Grand Central riot and, over two evenings, attracted an estimated 10,000 fans. — J. Hoberman, Everything Is Now, 1306