You are a kind soul, but no illness can be blamed, if it were and infant or someone else unable to get to the bathroom then that's different. Kids have had accidents and I'm prepared. This was a festival booking, that involved an adult (or several!) with a total lack of shame.
I have phoned customer services pretty relentlessly to little or no avail, but I will check the other stuff. Thanks so much for your time. It's comforting to get a response, even if it isn't from where it needs to arrive from!