Def recco the Language Exchange Meetup at The Moat House on Tuesday nights at 7:30. No language is exchanged. It draws about 50-70 people, maybe 20% Thai, the rest Chinese, Digital Nomads, and international students. Great mix of ages.
Some great meetup groups in Chiang Mai. Also Google Steve's list of events. Tireless Steve lists every event and charity function going on every week.
I lived in Nimman:. 4* Apartment behind the mall, eating out very well all day, every day, various massages and drugs, health insurance = about $1,000 a week.
I now spend 50% more living in Bangkok (my rent is 65,000K) due to better restaurants and dating.