I'm interested in basically all of the topics you have listed. Figure start with beginners and work towards the more advanced, and definately the emergency roadside repair is a must.
You forgot one important skill: bar wrapping!
One other thing - it might be best to split your proposed two sessions into three. I believe there is a need for a session devoted to typical "emergency" road-side repair work - fixing flats, loose cleats, dealing with broken spokes, etc. There's a world a difference in fixing something for good and fixing it just so you can get home. I also know that fear of being stranded keeps some members from pushing themselves for longer/faster rides - they don't have the knowledge/confidence to deal with any mechanicals that might arise when others aren't around to help (when riding solo, or if one gets dropped).
After that, there's probably an interest in learning how to do basic/beginner home maintenance (like derailleur adjustments, wheel truing, etc.) as well as interest in learning the more "advanced" maintenance techniques.
Personally, I would probably be interested in the advanced session - this is stuff that I sort of know how to do but that I typically pay others to do for me because (a) it takes me a long, long time to do and I'd rather ride than fiddle (e.g., re-cabling a bike); or (b) is just plain messy when I attempt it (e.g., disc brake bleeding). If I can do it faster, and with less mess, I might be tempted to tackled this sort of stuff myself.