More than happy to back away from this and let locals arrange it if anybody wants to volunteer.
You would need to find a cheap Travelodge or similar for the Friday night for everybody, a route on the Saturday starting at 9.30am, driving until noon (about 80 miles), an hour and a half for lunch, then another 80 miles or so to a fairly nice hotel with room prices about £80 a night or so and a bar. Needs good parking for the Friday hotel, the Saturday lunch stop and the Saturday evening hotel. Bear in mind you may have people coming from Devon, Cornwall, Kent, London and everywhere in between so assume they will have driven 9 hours just to get there on the Friday and the same back on the Sunday.