Below is the Final 2013 season's calendar unless more are added during the season this is it. Currently there's Lock City, Drift Faction, Drift Spot, Clubloose, Clubloose 2, DMCC(rds1,2,4-6), DriftThing, FD (rd4), RSD, Drift Cleveland, 200 Drifters of December.(updated 10-29-2013)
Click the "Look for more" button or scroll down in the calender to show more events (it only shows about 40 days from the current date when it loads)
Clicking an event will expand it with more details. There's also a pretty slick print function if tattooing tree pulp is your thing.
Also available in iCal and XML
If you don't see your event on here you probably didn't give me any info, send me a message with the relevant information and I'll add it to the calender.