My iPad mini used to sync my calendar and contacts automatically when I connected it to my iMac with the USB, turned on WiFi and let it sleep for a short while. Now, no matter what I try, I can't get my calendar from my computer to my iPad.

Thanks for trying, but I had already checked that out. It just didn't sync even after I managed to find a place that said Calendar - not exactly obvious under Settings. I did manage to finally do it - hopefully it will last. I had to go into my iCloud settings on my iMac and select Calendar, which had somehow become unselected. I hate every single update that screws things up and never seems to improve anything.