I'm not sure if Snake Saturday originated in North Kansas City or not; a google search takes me straight to the North Kansas City Snake Saturday parade, so perhaps it's unique to that area.
One year my daughter and I found ourselves passing through North Kansas City at just the right time to be caught in the beginning part of the parade; crowds lined the street. Rachel, at the wheel, said, "Mom, what do I do now?"
"Just smile, wave, and look green," I told her.
Oh, and while I'm at it: Happy birthday, Rachel.