Bonnie MacLean was Bill Graham's wife at the time. She had been doing the chalkboard announcements at the front of the Fillmore for about a year. When Wes Wilson and Graham got into a huge snit about the posters (the money which Wilson wasn't getting), Bonnie stepped in and handled the work for about nine months, until other artists joined in creating 'em.
See ART OF ROCK for the full story.
you think the 67 version of a message board commented on her debt to Wes Wilson ?
Though she later moved on from that "style " Mrs Bill Graham at the time