Where?
Different sites every year so far, notified of course after booking (all part of the fun. not knowing where
), all in Wales so far
Basically 2 nights camping, optional 3rd for a relaxed Sunday afternoon and de-camp, sometimes local green-laning on Monday (adhoc)
Sat night barbecue for all, bring basic food, barbie provided with sundry accoutrements.. Campfire both nights normally...
Families and children welcome, but wild camping! usually near to a riverside, standpipe water available, no loos...
Driving, talking, crawling under vehicles, more driving, more standing around talking, more lunch, more talking, more driving...
When?
Either 1st or 2nd weekend in July, braxcketing July 4th, hence Syncropendence day
Article in Camper & Bus March on last year's should give you a very good flavour of what SP's are about
As Doug says, lots of stuff on the Syncro website, description of SP1
Cheers