If I was going to Matlock from Rivington then I would use M6, peel off at Macclesfield turn, cut across to Buxton then down to Matty Bath.
But the Rivington meet would have to be early and the Matty one late as I have never yet been to a meet where everyone is where they say they will be at the time they say they will be there..... flipping motorbikers, always doing their own thing