I usually frequent CPX since I always have passes and paint from there. I wouldn't mind giving blast camp a try.
I don't know how many people from AO attend LL; I see the occasional AO jersey and misc swag (not to mention some pretty cool mags) here and there. To my knowledge, there has never been an organized effort to meet up. It seems like the closer you camp to the main building the longer the party goes (or "shenanigans," if you prefer).
Personally, unless I'm demonstrating how my camping shower works to a dirty yet trusting member of the opposite sex, I'm usually in my tent sleeping at a reasonable hour.