They won't release the official schedule for that until probably later this year or early next year. If schedules follow the norm that is probably the right weekend.
Actually, there is a tentative calendar on the usna website. The date for I-Day is Thursday June 30, 2016. I'm not seeing the date for PPW but it should be approximately the same as past years. This past summer was 6 weeks and parents weekend started the Friday after the 6th week.