Every single tiny bit of information that can be gotten at a workshop can be gotten on the internet nowadays. The thing that can't be done on here, is practice and experience. Save your money, sit at home and do some research, then go buy some equipment or something material and shoot until you're good.
Edit: I guess what I wrote is a bit of an overgeneralization, but unless it is a workshop like GPP or one of the shooting nights that Chase Jarvis has put on, I don't think I would go to it.