Calendars and enumlist

Hi All

I have added two calendars where I want the attendees to be a enumlist with a ref to a different data source with a list of names so I did the following:

and

but on the app itself, the field disappears when I sync. Any ideas?

And then how do I make the creator be the person signed in, instead of the app creator? Can’t use the security filter as it says the user does not have access to that calendar and throws a error, so want to have a formula that says make the creator = user email or something like that