craftgrrl | Teaching a crochet class

I got got a gig teaching a weekly crochet class at Michael's Craft store - hooray 25% discount! I was hoping for some input into my lesson plan. The problem is is that someone can sign up for any week they want or keep coming back week after week. After a little while I am likely to have crocheters with a little experience as well as people who have just bought their first hooks. I don't really know how to deal with this once it arises. Any suggestions?
Also, if you were taking a crochet class what kind of things would you want to learn and what kind of projects would you like to do?