1.Create a new event compact layout with the label: Showing Mobile Layout
2.Add the following fields to the compact layout in this order: Subject, Start, Property, Name.
3.Make the new compact layout the default for the Showing record type. (Hint: Do not change the primary compact layout for events. Enable the new 4.Showing compact layout in the Record Type Overrides section of the layout assignment editor.

For step 2. I don't have the option of the Property field and am unable to add it as a custom object to Event in the Schema Builder.
Also getting error id INDQUWUO