I have been mining this along with a number of other currencies and don't have the free time to read every thread post for every coin in its entirety. I was relying largely on updates to the website and OP for information on exchanging CAI for CAIx. I think that if there was going to be a hard deadline on making one-to-one exchanges, it should have been in the OP and in bigger, bolder lettering than the nearly meaningless updates. Scanning through the posts, I would see a lot of discussion about CAI mining ending, but relatively little mention of the game of musical chairs that we were apparently playing.
In the end, I only spent a few dollars worth of electricity to get CAI that were worth something like $25 last time I checked--so this isn't the end of the world. But I think it's worth mentioning that this doesn't seem to have been handled very well (unless I'm missing something, which I very well might be).
I sympathise, but if you're going to hold a coin, you should pay more attention to what's going on with it. I mean, c'mon, alts are volatile - one day they're hot, the next day they're worse than worthless... if you don't keep a close eye on your coins, you're asking for trouble one way or another.
CAI to CAIx exchange has been mentioned loads of times on this thread, on Twitter and has been written about on crypto news sites... there was plenty of time to switch.
Unfortunate timing. Had you been a day earlier, you'd be fine.