I assume that you are going to be using slides or some type of presentation media? If you would like one or more of us to review that ahead of time, that might be a good idea. Nothing personal but there is an excess of "introductory" web pages, blogs, and youtube videos that are either misleading, obsolete, or just plain wrong.
If you don't want to post anything publically, you can PM me with a drop box type link. I can't volunteer the time of anyone else, but reyalp, philmoz, srsa_4c, and msl are currently quite active on this forum and know what they are talking about. You might message them too.
Meanwhile, please be sure to point people here : CHDK Wiki : Links
and here : User Manual
and strongly recommend they look at this if they are going to try installing CHDK : CHDK Wiki : Prepare your SD Card
and that they use the link at the top of the page pointing to : STICK
and finally, I assume you will mention CHDK scripting (at a FOSS conference) so this link probably would not go amiss : CHDK Scripting Functions
Finally, I've been plunking away at this : CHDK_Dummies_Guide_2nd_Edition
. If it gives you any ideas or causes you to think of things that should be explained there, I'd love to know.