I create a three-day Event.
Then I [Add] three days. I can choose from entire calendar. Seems like I should only be able to choose from those three Days.
Note: There are two possibilities.
1. Event Start & End Dates not set. In this case the whole calendar should be available.
2. Event Start & End Dates set. In this case only those dates within the Event range should be available.
Then I [Add] Session to a particular Day. I can choose any of the three Days. Seems like I should only be able to Add Session to the Day that I chose (+).