It'll happen. We went to BM a couple of years ago, well several now, probably in 03or4. Came back to a buddies rig, tire flat. Got to getting stuff together to change it an there's a can of fixaflat on the back bumper. We thought, wth? Got home and was relaying the story on another forum, thanking whoever left us the fixaflat ( on a longshot of them being on there). Turns out it was the Dad of a guy on the board, who we had met at the hotel the evening before. They were from MS. Great guys.
Anyhow, I get off track sometimes, you are subject to have that kind of thing, or worse, wherever you go. Just be as prepared as you can. I wouldn't let that keep me from going though. Just a heads up.