If you are familair with creating Standard events with Cvent, you already know 70% of Flex. Flex has taken Standard registration to a whole new level with a drag-and-drop Site Designer and Email Designer.
Even those without a Cvent login can access data through a password-protected URL whenever they fancy, and, best of all, without needing to pester you. You'll just need an eComm specialist to get a Report User added to Cvent and create the desired Parked Report.
Learn how to create sender profiles, delivery profiles and send classifications in Marketing Cloud so that communications contain the correct from information, email footer and commercial vs. transactional distinction (CAN-SPAM Classification).
Advancement communications are intended to be sent through eComm - and there are processes in place to achieve this. In order to capture your desired audience, you will have to work with both Advancement Reporting and your eComm specialist.