Back in the early 80s I was playing bass in a synth pop band http://www.synthzone.com/ubbs/Forum35/HTML/001385.html

We were carrying so much gear, concert PA, 24 PAR 64 lights and stage gear that somehow I overlooked putting in my bass guitar. I didn't realize until 30 minutes before we were about to play and didn't have time to race home to get it. A friend that lived nearby had a fretless bass .... well I can tell you playing a fretless instrument for the first time live at a gig is not exactly the way to learn. I made it through but I was sweating the whole time. Fortunately it wasn't recorded because I'm sure my intonation wasn't at all perfect.