Yes, in a nutshell. The doorkeeper may take a photo of you using digitaldavos.app and just enter your name, company, and email address as an onsite request. This request is sent straight to the cellphone of the designated event organizer, who can approve or refuse your entry.
If you have an invitation pending, please do not seek to be added at the door again because your application was not approved by the event and a second application is merely more work for the organizers.
Once you’ve been added at the door, there’s no need to contact the organizers.