I contacted Apple Support and was lucky enough to get moved to a senior rep who was helpful and knowlegeable. She identified another report that convinced her that the issue was on their side and was going to escalate it for a fix. Hopefully that will happen quickly. I also noticed if you enter an all day event, it does not remain on the calendar. But, if you open icloud where one of the page segment reports todays events, it will be there. So it's in the cloud, and it is syncing, but it appears to be something with the view of the calendars. The best thing we can do is to continue to report it as an issue. If it is wide spread it will receive a greater priority. I think it just happened, maybe today?