I use the Agenda+ Widget since the stock iOS calendar widget is incapable of showing all day and future events in the widget... Yesterday I noticed it started showing “No Events”. After some troubleshooting with the dev, this actually seems to be a problem with Apple’s iCloud service. In the Calendar app under other, there is now an Untitled Calendar where I believe it was previously Holidays. You cannot delete this calendar, but there is a work around that removes it, and happens to fix my Agenda widget. Settings>General>Language & Region> change your region. Since I’m in the United States, changing it to U.S. Virgin Islands worked. I’m not sure if other regions are experiencing this issue.