Per Alaskan1963's request, I just made a dummy “Go Kings” gmail account and created a completely public, editable map. I added myself and Arco Arena.
After some testing, it seems the only catch is that you do have to sign in to Google to add a placemark, and then your placemark gives a link which you can hop through to see the other public maps in your profile. So if you have public Google maps you don’t want to share, do like me and create a dummy Google account, then go place your placemark.
Here’s the map url:
Go Kings, Worldwide! Show your spirit and local flavor!