Agree - also gives you an opportunity to check out the club/punters etc.. Have a beer with the bartender, chat about the type of bands/crowd they get.
We got a monthly house gig last year by being friendly with the club owner and showing that we cared about his venue and how we would perform there. We recently got booked for a further 6 months and asked to play the NYE gig there again this year!
All by going in to hang a few promo posters....
