Things I've tried:
(1) Set-Up (Event Settings & Registration Settings)
(2) Publish (content)
(3) Promote
(4) Manage
(5) Follow-Up
*** Counter Intuitive Last Step ***
(2) Publish (Layout& Design)
When trying to Publish after Reviewing all of the above:
My end of things
(2) Publish (Content) - After publishing the event