Might aswell get all my skateboarding fixes out of the way in one go.
This is footage of the legendary Bones brigade(including a very young Tony Hawk, white helmet, long hair) shredding it up in Livingston during a tour in the early eighties. Worth watching to the end where Hawk pulls off a "Mctwist" for the entertainment of all the Livi punters.
I would suggest that Tony Hawk is the most famous athlete ever to do his thing at a sporting event in Livingston.
The closest that I can think of to that was probably when Sturm Graz played Livingston F.C. in the UEFA cup in 2002. And who can remember any of the players that were on show that night?