Chill out for the weekend? Chill out?
If you arrive early on the Friday then pop to the Discworld Emporium first, it will likely be quieter than on Saturday and you can browse, meet the maddest fans, and probably Bernard too

Have a look round the Wincanton shops.
PS don't forget to prebook your meal at one of the pubs, or sign up for the curry, and collect you meal ticket from the shop.
Saturdays are always my favourite. All things to do are put on by fans. There will be a makers market during the day among other things, then the tradional sausage supper, a story telling session (Friday?) and some form of caberet/entertainment.
Sunday morning I suggest taking a walk to see Treacle Mine Road, or walking up to the Bayfor Hill viewing point out over the rolling hills

But don't forget about the tradional farewell message from Bernard!!

You will love it!!