I would think (reminding myself of my 8yr old nephew and his buddies -
some a little older) that you need to remember the attention span of
your audience.

Delving into the nuances, history and minutiae or woodworking wouldn't
keep their attention for more than a few minutes.

Probably just about anything would be fine as long as it was well
presented in a lively manner. Especially if you have visual aids. If
you try to give a comprehensive overview of woodworking and its
applications, you will lose them fast.

Robert