I would be more than happy to provide an intro in that slot - I've done a lot of similar presentations for education program events and for editathons. I usually use http://en.wikipedia.org/wiki/Wikipedia:CHEATSHEET as my basic handout type thing; it can be printed out, but we can also just give people the link (since presumably everyone will have a laptop with them.) There are a few others floating around, but I think WP:CHEATSHEET is the easiest/most compact to use.
I'll also try to come up with some possible topics and add them to the editathon page within the next few days.