Bump...!
BKV stands for Best Kept Volvo - the competition which is the centrepiece of the club's major events. Yes, it's competitive, and yes there are trophies. The only entry fee is VOC membership, which I think is currently £28/year...for which you get various benefits, including 6 editions of the club's (relatively) glossy magazine. In my role as the VOC's 300 series register keeper, this contains my ramblings about all things 300...plus usually a section on getting my car back from the bodyshop "by the time you get to read this" (a quote which has appeared in the past few editions...at least so I am regularly told!). It's back now, so hopefully the fun-poking will soon cease...?
There is more to the day than that, though. They're usually held at a visitor attraction of some description, plus there are a certain number of trade stalls (including autojumbles) and the like for you to browse. The National is the bigger event, but I've been to the Southern at least once, and that's a good event too. I'd like to get my 343 to all three of the big ones (Northern, Southern, and the National) this year, if I possibly can.
I normally end up judging the 300s at the national, so get your bribes ready

Hint: clean the engine bay. There are 20 points available in each of the following 5 categories: Bodywork. Trim (incl: lights, wheels, etc). Underbonnet. Interior. Boot. Not my rules, so don't shoot the messenger if you think it's daft (which I do - too much loading on boot and underbonnet).
Some people find these events rather sedate, but there's nothing too offensive about them to me (and I'm hardly an old fogey)...they're just a good opportunity to enjoy a (hopefully) nice day out looking at some interesting cars.
cheers
James