Who was the opening act for John Lee Hooker on April 11, 1961?

Dylan would write about this period in “Talkin’ New York” (1962), which included a verse about his breakthrough gig at Gerde’s:
"After weeks and weeks of hanging around
I finally got a job in New York town
In a bigger place, bigger money too
Even joined the Union and paid my dues."
Gerde’s was probably the most important folk-music venue in New York City at the time—the club that every folk act with a national profile played when they were in town. Dylan had previously joined other unknowns like himself onstage at Gerde’s during the club’s Monday “Hootenanny Night,” but the invitation to appear on a regular bill presented a bit of an administrative problem. At just 19 years old, Bob Dylan was too young to obtain the necessary union card and cabaret license. One of the club's owners, Mike Porco, was interested enough in getting the young man on the bill, though, that he signed on as Dylan’s guardian—”the Sicilian father I never knew I had,” as Dylan put it.