If I may offer a suggestion, you may do well to introduce the shop, your skills and the available classes through an open house one weekend when most people are off work. Food is a big incentive as well as discount vouchers presented only on that day. Demonstrations and short 30 minute mini-class presentations help folks to know you and get interested in the class.
I noticed many if not most of your classes are during the week when I would not be able to attend.
mike