Two week widget appears blank
Widgets on iOS have a hard limit on the amount of memory they can consume. Unfortunately, if you have a calendar set with a lot of events, the widget would appear blank as iOS would simply refuse to render it.
The only work around is to select a Calendar Set within the app with fewer number of calendars and events. From the Calendar Set settings, you can choose a specific set to be used for home screen widgets (instead of the currently selected set) to counter this limitation.
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