"4. A floor singer who was told they had 3 songs and after their 2nd song the organiser walks on stage and takes them off."

Grrrrowl. Happened to me. In a place in the Netherlands. I got three songs and was booted after the second. Cause was that organiser had just fallen deeply in love with my (admittedly very cute) predecessor, who rambled on for about half an hour with scraps of poetry before the Main Act came back on stage. And poor li'l me was sandwiched in between.

Needless to say, I was Not Amused.