To ensure the app regularly displays the current events from the Edumaps calendar, you need to enable synchronization.

To do this, go to the menu and select "Options":

Then select "Synchronization":

Click on "Webcal automatic synchronization":

Choose, for example, "2 hours" or "4 hours" as the synchronization interval:

Now the app synchronizes with the Edumaps calendar every 2 hours.