Drjohnrock

Not ones that were cancelled or postponed in advance, but ones where you showed up for the concert but the headliner didn't.

Sylvain Sylvain (ex-New York Dolls) had a free concert scheduled to promote a solo album. A guy walked to the microphone and said "Good evening. Sylvain Sylvain didn't show up." He went on to say they received no calls (pre-internet, kids) or other communication explaining why. That meant the opening act was now the headliner. Since I didn't care for the band (basically a new wave tourist attraction), I left. Oh well, the beer I bought and consumed at the venue was good.

Another time, I went to see Heart to find out Ann Wilson was under the weather and the show would have to be rescheduled. I was able to go the rescheduled date.

A friend of mine from school once drove two and a half hours in the rain to Wheeling, West Virginia to see Dan Fogelberg only to arrive and find out the show was cancelled (again, pre-internet). He got what he deserved.