I would contact the academy about this. Have you received an appointment?
What specifically do you mean by an "accepted students day'?
There used to be an Open House in April of previous years to hear more about the academy and explore its grounds, but not this year. Students who received appointments and either accepted their appointments or hadn't made up their minds yet, would attend for the day. It was very informative.
Come Sept 14th or 21 2013, there is Acceptance Weekend, where Plebe Candidates take their pledge, thus becoming Plebes. This is also considered Parents Weekend.