Howdy,
I am trying to embed an Event registration form on a marketing page. I have tried the following approaches with no real success..
1) Create Event Form,
2) Make it go live
3) Try to add to a Marketing page
Outcome: Can't select it (besides its not linked to the event in any way)
Other approach (more successful, but still fails)
1) Create Event Form
2) Make it go live
3) Go to Live Event and go to related "Form Pages"
4) Create the Form (this creates a Form Page that is hosting the Form)
5) Copy the Div & Javascript (so basically your normal external form hosting
6) Create a new Marketing Page
7) Copy content into Marketing Page
8) Go Live
Outcome:
1) Page has the form (Yah!)
2) Form submissions create Event registrations (Yay Twice!!!)
3) Form throws an error to the user when they register instead of a thank you message for registering :-( (BOO!)
Error: 
Which looks to be some kind of CORS error :

Because we are still configuring things out we are running on a default portal URL (so XYZ.microsoftcrmportals.com)
Any suggestions
Ideally we would like our Marketing department to be able to drop marketing registration forms into any Marketing Page as they need... But for now, just doing it once during this POC would be nice ;-)..
Thanks all