Where does Cheryl meet a romantic interest in Chapter 15: “Box of Rain”? Who is this individual?

Cheryl and Stacy head out to the Jerry Garcia festivities. It is there that she meets Jonathan, a slightly older, handsome man who invites her to a show and for a date the next night. Although she tries to convince herself not to see him the next day, Cheryl meets him at the club where he's working.