I haven't been stood up much by musicians (of course I haven't attended as many successful concerts either). Ry Cooder did walk out of a set because of problems with the amplification, and Ted Nugent was removed from the bill at the Hendrix concert, but I now look at that as a blessing.

Re: rekindling a lost friendship, Robert Wyatt's bleak take ("Where was that hatchet?"): https://youtu.be/rFu_7f9N6eQ