John is one of the "Three Irish Tenors" that were omnipresent on PBS for awhile; especially around 3/17.
Eric is opening for John, which could be a bit of a ticklish situation.
Bogle's rare Chicago visits are a big deal, like a comet to an astronomer.
McDermott, on the other hand, was through here just last March.
I was actually thinking of begging a local pub to extend an offer to get Eric to do a brief mid-night gig, but he's in Ohio the next night so . . . probably not.