I have subscribed to a calendar which contains what you might call in English "Thai Buddha Days" (วันพระ - Wan Phra) These are based on a lunar calendar, so tough to keep in mind. I subscribed to this calendar earlier this year:
Thai Buddha Days
It worked fine until this week. I got an alert the day before at 9:00 AM which reminded me to buy garlands for the upcoming day. However, I didn't get an alert today for tomorrow's Wan Phra. When I checked my iPhone and iPad Calendars, the subscribed calendar was still subscribed but all of the Buddha Days were gone.
When I check the Mac, there were still there. But, I still didn't get a note on the Mac. (Or, maybe I just missed it, but it should be in Notification Center and it is not.)
Mac

iPad
I've tried unsubscribing and re-subscribing, but that didn't work.
Any other ideas?
Thai Buddha Days
It worked fine until this week. I got an alert the day before at 9:00 AM which reminded me to buy garlands for the upcoming day. However, I didn't get an alert today for tomorrow's Wan Phra. When I checked my iPhone and iPad Calendars, the subscribed calendar was still subscribed but all of the Buddha Days were gone.
When I check the Mac, there were still there. But, I still didn't get a note on the Mac. (Or, maybe I just missed it, but it should be in Notification Center and it is not.)

Mac

iPad
I've tried unsubscribing and re-subscribing, but that didn't work.
Any other ideas?