How does Continuous Backup work?

No, there are no events. As the name implies continuous backups is doing just that, continually backing up the database to a secure location on your behalf. You do not have to manage anything for the backups to happen once you enable it.

If you want to trigger an on-demand full backup manually or automatically via AWS Backups you can, but that is outside of continuous backups with point in time recovery.

Thank you :) I needed verification of this information.