Maybe a talk about home brewing at the start of the day before the entertainment, or better still a live demonstration! i.e. now the mash has started, this will take 60 minutes, act one comes on stage does their 60 mins, then the transfer to the boil kettle! Another act come on while it's boiling, maybe some sort of spot light on the kettle as the hop additions are being added, then siphoning into a fermenter. Well it's gotten me in the mood to do some brewing just thinking about it!
I think something like that would be interesting to the average punter?