Saddledome in Calgary...

 https://en.wikipedia.org/wiki/Scotiabank_Saddledome

Of course having enough functioning washrooms is always a top priority.

https://www.scotiabanksaddledome.com/venue

Some fans from Edmonton over the years, have occasionally depicted the Saddledome as a giant toilet.

https://www.reddit.com/r/Calgary/comments/g99f2q/city_council_to_repurpose_saddledome_in_memoriam/

https://www.reddit.com/r/CalgaryFlames/comments/11g65vd/washrooms_at_the_saddledome/

https://flamesnation.ca/news/the-good-and-bad-of-the-saddledome

https://twitter.com/isuckatpicking/status/1526264718725287937

https://venuecoalition.com/wp-content/uploads/2017/12/Calgary-AB-Saddledome-Tech-Pack.pdf

https://globalnews.ca/news/9649603/calgary-event-centre-update-april-25-2023/

https://calgaryherald.com/news/local-news/arena-renderings-show-new-angles-of-planned-saddledome-replacement

https://twitter.com/FOS/status/1651228942517301251

https://globalnews.ca/news/10007181/update-calgary-flames-arena-deal/

https://www.cbsnews.com/minnesota/news/good-question-stadium-bathrooms/

https://www.golfdigest.com/story/new-york-islanders--new-arena-will-feature-more-restrooms-per-pe

https://www.nytimes.com/2009/04/13/sports/baseball/13potty.html

https://therabbitportal.blogspot.com/search?q=toilet+bowl