Not a regular fixture, but I'd absolutely love to see a possible Vs probables game in preseason. Hold it at Robin Park/DW and get a family type day organised.
There's some interesting sides that you could pick i.e Thompson at 13 Vs Ellis at 13. Leeming Vs O'Neil. Faz and Walters Vs Nesmeba and Isa. Or you could mix it up with Farrimond and French Vs Hampshire and Smith etc. There are literally loads you can pair up/off against eachother.