Hi - I just tested this, and closing enrollments does not seem to affect whether the “begin” button will show up. I created a session, added an evaluation course object, and set the enrollments to “closed.”
How I understand this to work is that when you create a new session, it automatically adds the “attendance” object to the outline. When this is a required object, it does two things: 1. It marks a person “attended” when they use the SMS code to text in, and it 2. Prevents people who click “begin” on the rss reg page from getting any further. (the difference between “enrolling” and “attending”) Even though a person who clicks begin is “enrolled” they would still have to text in the code to pass the “attendance” object, and would not automatically get credit or a credit letter if one is offered.