Creating some sort of friendly competition is always good for inspiring people to work harder for their LD's. Similar to the task clubs that are about here. The nova dreamer idea is really cool.

You should also have activities like, Folk lore of Lucid Dreaming, debates on shared dreaming, AP etc.
Tips and hints on how to write in your DJ to increase recall (such as writing in present tense).
Theory discussion - where everyone comes up with a creative theory about LD'ing or something you can try during an LD and then tries to prove/dis-prove it.

Basically anything that gets people actively involved, but this is a great idea man, I wish I had this at college