A wonderful anecdote from SF author Theodore Sturgeon.
The photo in the story is from the Worldcon in Kansas City (MidAmericon). I was there, and you could get books signed by Heinlein–if you donated blood first. I did. The photo in the article is cropped, but you can see the whole thing in the Wikipedia link (and below). The woman in the photo is wearing a “Mpls. in ’73” t-shirt, which brings back a lot of great memories of SF fandom in Minneapolis in my college years.