I'll suggest a coin quilt, very easy and fast! Also, at the beginning perhaps have a go around of all attending, stating name, what they already know, what they wish to learn, and a little about their general background. That will give you a gauge of how to lead the session. Good luck!
I had another idea, it looks like you are covered materials wise, but would you perhaps like donations of quilting books? It would be great if your program continues to have a little lending library set up!