greetings:

I found what may be a fault in the event registration.

The fault is that a user can register for the same event every time you wish thus creating a constant spam.

With reference to this. it is possible to include an option in the registry settings so that if a user registers an event not to re-enroll in that event.

This is because sometimes you may want to only do one record for each user.

It would be possible to make this implementation?
We are working on it?