Paul and Jimmy,
Ken & Scruffy are the principal owners of the pub, with the rest of the band holding a minor interest. Anyone who drops into McGreevey's is sure to meet one or more of the band members, and are likely to be served a stout by Ken or Scruffy(the primary landlords). The members of the band are real down to earth and like meeting their fans on a personal level whenever they can.
I do not know Glasgow or where the band will hang out while there. You could go to their website, and a short time before the concert post a question to them as to where and what - - you could get a reply to where to meet and greet.