Thanks for the responses, guys. So Beer's favourite music venue is a grocery store? Cool.

That website also looks useful.

For the benefit of anybody else who may be going, here's what else I've found:

Song circle on the last Thursday evening of the month at the Crow's Nest: info here.

A guy I met on Youtube (Newfiefiddler - has several music videos up) sent me this message:

"St. John's has three sessions as far as I know: Erin's Pub on Water Street (Friday evening), O'Reilly's Pub on George Street (Saturday evening) and Bridie Molly's on George Street (Sunday afternoon). I have been to either place to take in a session for a while now but I imagine they still have them there. "