Once a month we do a brownbag where people come in and do presentations. It's voluntary and fun.
The best thing to do is to have toys to show off. Just recently I walked around with a "coupon", an 8" diameter chunk of steel cut from a pipe. This let me talk about water pressure, safety (there's 4,000 lbs of force behind that coupon in a waterline) and give everyone a visual of that thing coming loose and whacking someone in the face. Perhaps not related, but it let me segue into our control system, and 25 miles of fiberoptic cable, and control infrastructure that lets us control our water delivery throughout 250 miles of waterlines.
Tell stories, illustrate your points with real world events. Don't dwell on statistics or numbers; talk about what those numbers mean and why they're important.
Yes, you are an entertainer. At least if you want to keep your audience from falling asleep.