A Brief History of Comic-Con International's Robert A. Heinlein Blood Drive
Then in the early 1970s, Heinlein had a life-threatening illness and needed many pints of a rare blood type. He felt he owed his life to the donors, so when asked to be a guest at the 1976 World Con in his hometown of Kansas City, he agreed-but with one specific stipulation: that he would only sign autographs for people who donated blood.
Thus longtime Comic-Con committee member Jackie Estrada approached the author with an offer to hold a blood drive in San Diego if he would consent to being a guest. He agreed, and in 1977 Heinlein came to Comic-Con. He and his wife, Ginny, had a great time and Heinlein even drew a picture for the Sunday morning Art Auction.
"David Scroggy [now a Vice President at Dark Horse Comics] was the first blood drive coordinator," recalls Estrada. "We also had Theodore Sturgeon there signing his book, Some of Your Blood, which he gave to all of the blood donors. We also had entertainment for the people while they were [donating blood]. I remember that Leslie Cabarga played the piano, C. C. Beck played the guitar. It was a very fun event and Robert was delighted. We've had the blood drive every year since."