The Spinal Tap reference was when the band were trying to get onstage and were walking around various passages and couldn't find their way onstage.
We had a similar encounter but outside. We were walking round and kept finding different doors with service numbers on them. I chatted to Steve and he said the stage door was round the corner. We kept turning corners but couldn't find the stage door so we gave up. It was also partly because my friend had to be up early the next day.
I got home at an extremely late time as it was, so if I'd hung around much longer I'd have seen the sun rising (slight exaggeration