We don't get rained out!
Plan accordingly - ie bring some rain gear with you. Not your muck boots, still plan on wearing your tennis shoes. We recommend you stick an extra pair or two of socks in your fanny pack. Don't knock it - fanny packs are cool. The only way we are cancelling is if the Fabulous Loudoun County Sheriff's Department makes us! They aren't afraid of a little rain :)
As we used to say in the U.S. Army "If it ain't rainin', we ain't trainin'" HOOAH!