The Calendar card on the Glance view does not seem to sync regularly. Sometimes it only updates when I go to the Glance view.
The Calendar page does not update at the same time as the Calendar Card. I rely mostly on the Calendar page since it shows more items than in Glance. But often is has outdated entries, even if the card in Glance does not. Sometimes the Glance changes appear on the Calendar page, but often the do not until after long delay.