I'm a mobile app developer and I have got most of my work from meetups and local business events. Just remember that going to the geeky meetups will only get you so far. You need to think who would buy your services and go to meetups made for them. I've had the most success with product management and other business related meetups.
Obvious in retrospect but a very good suggestion. I mostly go to geeky meetups and usually lament how everyone is the same. When I go to the odd business meetup, I find a very diverse crowd. Finding the right business meetups can be hard though. Any thoughts on how to find them?