Are you sure you have added the relevant events to the calendar for that category? Check the calendar view and be sure you have the correct time and date for the events. Alternatively, check the calendar settings to make sure the widget is set up to display events from that category.
- Check the calendar view: Make sure the events in the specified category are in the calendar for the selected time frame.
- Check time and date settings: Make sure the time and date for the events in the specified category are entered correctly
- Check widget settings: Check that the widget is set up to show events from the specified category.