I am making progress at adding custom fields to the Events and Sessions Entities, and adding them to their respective forms.
I found that one cannot create custom fields from the New unified interface, under Power Apps > Solutions > Event Management for Dynamics 365 as it is a "Managed" solution. However, I found that it was possible to create custom fields for the event entities going through the old Advanced Settings > Customize the system.
So what is the correct way to do this? Should I be creating a new unmanaged solution and add these entities to it? I would rather do thing correctly and preferably in the new interface.
As always your help is greatly appreciated.