A one off class isn't enough time to learn a technique especially if you are a beginner. A week by week class is better. If you have experience then as jodimarie said there is so much free information on the net. Do you have a friend or two whom you could invite in once a week and pool your knowledge. Decide what you want to learn and search the internet before hand and find a couple of videos on your subject. You can also ask here on the board for information. You could also borrow books from the library to learn from.
I belong to a group of three and we share all knowledge. We did meet in a weekly class around 8 years ago. We were originally a group of 5 but one friend passed away 3 years ago and another's husband has cancer.
We started a private group because the women supposedly teaching us was more often in the shop and not the class room and the beginners were asking the more experienced among us for help. She also didn't want to share information with her students.
Our little group have so much fun and are always ready to help each other.