MK opened for Bob Dylan in 2012, a few weeks after Superstorm Sandy, as I recall. It was at Barclay's Center in Brooklyn, and it was a sellout.
I would say 80% Dylan fans and 20% Mark. Mark played a great set for around an hour, then stayed around and played on Dylan's first 3 songs. My wife and I had floor seats, but when Dylan came on, she couldn't stand his "voice", so she said she's going to the concessions and for me. After Mark left the stage, we left the arena. So my point is, I don't expect too many people to be like we were and show up for Bonnie's set and then leave before Mark. At least, my wife like's Mark's voice; she's been hearing me play him for 35 years so far!!
Saul