Invitation to Naval Academy Summer Seminar

Monday, I got a message on the phone saying that I could go to the Naval Academy Summer Seminar. I had originally applied in February, and was rejected. I suppose that someone they offered it to originally couldn't go or something. They gave me 4 days notice. I had to cancel my planned trip to Busch Gardens in Williamsburg, reschedule my white-water rafting trip, reschedule my medical exam, and find someone to work for me on Saturday. I am not sure yet if I have done the last one. I have asked someone if he can work my shift for me, but have yet to receive a response.