Steph-x

I'm trying to get my mate Tiernan Douieb to come up to do a comedy gig here. Who would I contact to try and book something in the Lemon Tree or Snafu? Or any other venues that are particularly good for small comedy shows for that matter. Alternatively, do any of you happen to know of a local comedy promoter? Sorry, lots of questions but I've never done anything like this before.