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We don't have any "official" place to stay, but if you need some suggestions, TravelFish has some good budget recommendations for Chiang Mai.
TravelFish: Guesthouses in Chiang Mai
Some people who are coming up from Bangkok are staying at Chiang Mai Hip Guest House (87/1 Sriphum Road, Sriphum, Muang, Chiang Mai, 50200; Tel: 053 212618, about B500 / night). They don't have a website and I don't have any more details on it at the moment.