If I remember correctly, the guys at chiptunes=win have been experimenting with booking tours, and had a successful NE run with like three artists on it. I think it's all starting to come together. But let me tell you, not making much money from a tour is something that transcends genre. I toured three times with my last band and every single time you come back home with more fans but less money.
I've had some chip show offers recently and it's always come from personal connections with other artists. Stuff like I was on a compilation with this guy, reached out and mentioned I dug the track, get to talking, become friends, somewhere down the line they mention an opportunity to play a show together, etc.
Can assume it'd be hard work to make stuff like that into a consecutive tour, though.