I was there at the tourney, and am pretty sure I played in your son's group in qualifying. He did great BTW.
I witnessed the urinating as well. I also spotted her eyeing people's unguarded beers outside, looking for an opportunity to down them when no one was watching. She caught me staring at her from inside the bar, and then shied away. Her eyes told the story of how inebriated she was already.
Pinball does very well in bars, especially in urban areas. Moments like this are going to continue unfortunately in places like downtown Oakland or SF etc. The upside was that your son got to hang out with a great group of Pinball enthusiasts from the Bay Area (70+ !!). Shoot, he even got to see Neil Shatz, a living pinball legend that very rarely plays in tournaments anymore.
I hope this doesn't hinder you both coming out in the future. It was good to meet you both.