Yes - I went up to my mother's 90th birthday.
Braved the warning of my parents ("be careful, I wouldnt like to come back from there after the pubs have closed") to go to a nice open mike. There were abut fifty people.
But what do you sing at a strange open mike when you only have one song?
That's a great question. There was a bluesman who ddid Skip James. Some kids who attempted Django.
Answer: "All shall be well".
Why? An original ssong
A story Song
A character song
A song with a big finish