Congrats!
I was notified of my CoE Shipman nomination two weeks ago. There isn’t that much information available online regarding what actually happens during the weekend.
But here are some links you and your son can check out –
UMich Merit Scholarship Thread:
http://talk.collegeconfidential.com/university-michigan-ann-arbor/1731309-merit-scholarships.html
UMich Financial Aid page regarding Shipman Weekend (Itinerary and Detailed Info): http://www.finaid.umich.edu/TopNav/ShipmanWeekend.aspx