There are several similar threads. It never happens. Problem is sites start so early that to get there means leaving before dawn for most people. I went and joined Esoterick at X-Site in High Wycombe on Saturday, great day out but I had to catch a train at 6am from Bristol. If it was Huddersfield for example it would mean travelling up the day before and camping. I would do that as I usually have to travel for WW2 games anyway but most people wouldn't.
Incidentally that was a train at 6am after finishing work at 3am. I had time to get home and get everything together and leave for the station (no sleep).