It is called a "Quiet Period", and D2 doesn't have one for baseball.
Here's the definition: (although it is only used in football and basketball)
13.02.4.3 Quiet Period A quiet period is that period of time when it is permissible to make in-person recruiting contacts only on the member institution’s campus. No in-person, off-campus recruiting contacts or evaluations may be made during the quiet period.