I know this thread is about
not being fired but some have posted about being sacked so here's my story:
I was in a jazz band when I was a teenager. My 18th birthday was coming up and I organized a birthday party. Invited the band members too. Lo and behold, a gig opportunity came up the same night as my party. I told them I couldn't make it as it was too late to cancel the party. Next thing I know, I'm informed that I'm no longer in the band. I couldn't believe it! It's not as if I was on the outs with them beforehand. None of them showed up to the party of course. They must have regretted their decision however because I was asked to rejoin shortly after. I didn't say yes right away though, I let 'em wait while I made up my mind.

I eventually rejoined.
The annoying thing is: The band was big enough that had it been anyone else in the group who couldn't make the show, it wouldn't have been an issue. But no one else played bass!
Chalk it up to silly, immature teenage behaviour.