Try Hoboken. Right next to Jersey City. There's an Irish Place called Quay on Sinatra Drive that has good music. There are tons of Bars within 1 square mile. Even Better--The Goldhawk on 10th & something. (wish I could be more help--but I'm bad with knowing where things are) Smaller pub places would be McSwiggins on bloomfield & 1st or Duffy's on Bloomfield and 4th or fifth. The big music venue is Maxwell's on Washington and 12th.

I'm sure you could find something about these places online.

Tell us if you find anything!   And what is the info for the Jersey City gig?