iCal URL calendars can connect to calendar and repeater widgets inside your Connect app.
Click widgets on the left hand panel and add in a calendar widget or a repeating grid.
Select the widget on the app builder canvas then click on Connect to Data Source in the right hand properties panel.
Next click on iCal Calendar under the Create a Connection heading.
Paste in the iCAl url then click Import data
Validate the data is correct then click continue.
Set the synchronization frequency then name your connection and select if you want to share the connection with other apps.
Name the data connection, then click continue
Now you are ready to use your iCAL Calendar connection in your Connect App. Click close to return to App Builder.