Wilson published his memoirs, Mookie: Life, Baseball, and the ’86 Mets, with Erik Sherman last year.
Jay Goldberg, the owner of Bergino, said in an e-mail:
In brief, the event came about strictly because of the mensch Mookie [is]. Erik and I tried to put together a book event last year [but it didn’t work out]. We kept thinking about a way to do an event with Mookie, so I brought up the idea of something for charity. Erik spoke with Mookie about his availability. They finally came up with a date that worked for all. Mookie said he’ll do anything, sign anything, whatever we want — but it has to be for the Viscardi School.
Frankly, I had never heard of the Viscardi School. But after visiting them, I completely understood Mookie’s feelings. It’s an amazing place.
Goldberg elaborates about his experience with Viscardi here.