For those who did not identify the guys on the photo, but wanted to know:

Three intellectual leaders of the "BEAT/D(EN) GENERATION" (in the 50's/60's):

Ginsberg, Kerouac and Burroughs.

They cannot speak in Tucson this month, but everything this wonderful
prose-trio said and wrote, will always be with us. Even in Tucson!

American Heroes of the "BEAD-Generation!"