Thousands of fans showed up for the 1974 International Star Trek Convention at the American Hotel. By 1976, three Star Trek conventions ran in New York within a two-month period (fancyclopedia). I attended the Al Schuster convention at the New York Hilton, which attracted tens of thousands of fans (upwards of 50,000!). I waited on line for hours but did manage to get in, although thousands didn't. It was disorganized and not planned well at all. The convention was investigated by the New York Attorney General because many ticket holders couldn't get in. Most memorable moment for me: William Shatner getting a cream pie tossed his way by a kid who was goaded into doing it as a joke. Shatner handled it all like a pro and the audience ate it up.
This is the blue cover, newsstand, edition of the Star Trek Lives collector's issue. The Monster Times also published a grey cover edition that was available only at the convention.