In the 1970s when I was 6 or 7 years old I attended a hall with no air conditioning. One summer day it was so hot that they propped open the front double doors to try to get some airflow.
A stray cat walked into the lobby, walked slowly up the right-hand aisle (there were 3 sections of seats), sniffed around the stage, and then slowly sauntered back by way of the left-hand aisle and back out onto the street.
And, nobody did anything about it! This was a ten minute or so event that kept me thoroughly entertained. There was some subdued snickering, but, generally, most people pretended it wasn't happening.