The “At a glance” widget isn’t working as I expect
The “At a glance” widget only displays calendar events for an event that is occurring in 30 minutes time or less. The widget intentionally does not display ‘all day’ events, or events that are starting in more than 30 minutes.
It is possible more customizations will come to the “At a glance” widget going forward. These features, as well as the ability to select which calendar to display events for is a common request that is being considered.
See here for information about the weather forecast on the “At a glance” widget.