This may not work for what you are looking for, but I would love to be involved in a photo seminar. My past club did this. It takes someone real special to arrange it and someone willing to teach (could be the same person, but might want to share the load). They set it up so it was a small group hands on teaching with 4-6 people in each session. Members opened their homes and tanks for pictures. Everyone brought their own camera (from point and shoot to high end SLRs). These were done on Saturdays over the course of a month I think.

I also like the DIY projects where the kits are bought in advance and there to do as you are being taught. I won't go hunt down the supplies because I can never find them and I totally forget what I learned by the time I do.

I like the phyto tube, another idea is screen tank tops.