There are quite a few places here in Chiang Mai however I find most of them a tad bit hostile and they are all pubs. There are some small groups in the area that meet for coffee on a regular basis but I only know of one "the witters club" they meet at the paparazzi on Thursday night at 8:00 PM on the second floor. Just a word of caution they are serious writers and get annoyed if you poke fun at their work.