Don't even tease me. I can be there in 45 minutes, and have seen some great bands there (alas, not DT). Marillion, Cheap Trick, Night Ranger, Ace Frehley, Wolfgang Van Halen... I peed next to Ian Mosley and Mark Kelly after the Marillion show. I followed proper urinal etiquette and kept my eyes down and didn't say a word.
One time I was at the Paramount in Denver, which, if you haven't been to, has a fun basement section with another bar and the coat check (it's an old, old theater). Sometimes when I go there I like to hang out pre-show in that area because it tends to be quieter and less people, etc. Easy to meet up with folks.
Anyway, the last time I was there seeing Dream Theater, 2022 Top of the World Tour, I was down there doing my normal thing when I went to the bathroom. When I walked in, I was totally alone, so I walked about 85-90% down the row of Urinals, leaving one, maybe two urinals to my left, and about 8 or so to my right. Anyway, I'm standing there heeding the call of nature when out of the din of laughter from a crowd outside I hear footsteps stride into the bathroom. Looking forward, and trying not to turn my head (I wanted to follow urinal ettiquette), I didn't know who walked into the bathroom until the dude strolled up all the way to the urinal immediately to my right and also started heeding the call of nature. My first thought was, "Damn, this guy doesn't have urinal ettiquette, kind of weird to just slide right up to me when there were so many other ones to pick from," but as I zipped up and began towards the sinks, I realized who it was who had just slid up next to me. None other than Jordan Rudess. Never got a chance to talk to him, but it makes for a funny story.
The only other time I met a member of DT was MP at an Opeth show in New York City circa 2008 or so. No urinal story there, just a normal chance encounter/handshake.