I've got a couple of banjo classes starting this week at Dusty Strings. The classes will meet every Wednesday night for the month of November starting at 6:30pm. Here's a link describing the classes and their respective meeting times.
The classes are geared towards someone who is not a total beginner. They're not super advanced, so if you've been picking for a while you'll definitely pick up some great information. Feel free to contact me if you have any questions.