First of all thank you for your answer. Sorry I wasn't clear enough.

ops: I'll try again.
About registration:
We organise exam sessions for obtaining permits Category A to Category E. During each session, multiple categories are offered. Attendees have to choose one or more categories for which they want to take an exam. But, during some sessions (events), we only offer e.g. exams for Cat A, B and D, while during other sessions e.g. Cat B, C and E are offered, depending on the infrastructure of the venue. This means that all events have to allow for attendee registration, but the registration form has to limit the choices to those categories for which exams are offered during that event.
About export of data
I understand that it is not possible to add each separate registration as an attachment to an e-mail.
Would it be possible to [u:1zoki7e2]automatically [/u:1zoki7e2]export a file with all the attendee data for the event at a given time, without having to log in as event creator or admin? In fact this information does not have to go to the event creator, but to the examinator and we don't want to give the examinator access to the back end.