I was at the provincials at Langley a couple years ago, and they did offer some (limited) on-site camping there was lots of trucks and trailers there then. I'd maybe reach out to the club and see if you can reserve a spot. other wise there's isn't really anything that close by. There's a few options in northern Langley. Derby Reach, is regional park campground. its pretty nice; right on the fraser river. There's also the Fort Langley Camp ground in Fort Langley. Both of those are about 30 -40 min away from the Langley range though. Good luck, hope this helps! and i'll see ya at the provincials!