Issue Description

This idea is regarding an issue with Events created with different sessions and the Allow registrants to create their own agenda option is turned on. I will describe the problem with the following points:

1. Normally, if a contact goes to the event website and does not select any or removes all sessions form the shopping cart, he/she will not be able to finish registration. This is deemed as a standard validation from Dynamics 365 Marketing, because the button to proceed is disabled unless you select at least one session.
2. However, if the contact opens the event website and quickly clicks the Register button before the sessions are loaded (a spinner icon will appear in lieu), he/she can proceed to the registration form without selecting any sessions.
3. The contact will eventually be able to submit the registration form without any session selected. This contradicts the validation as explained in point 1.

Suggested Fix:

There are two places where the validation should be added to enforce at least one session is selected for "session-enabled" events:

• The event website should not allow to click on the Register button unless there is at least on session selected.
• In the event registration form, the contact should not be able to submit the form unless there is at least one session selected.