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
I read the thread titled "Create and enable a compact layout : Trailhead Challenge" and I thought that was my answer but I did the link to the Contact page correctly and I am still getting the error. I have refreshed my developer version of Salesforce and I have refreshed my Salesforce1 app on my phone.
The actual compact layout I built in the wizard but could not locate the place to set it as the default until I search by title and it was already set as default in teh Contact page.
Below is the screenshot from my phone showing the page layout is working properly.