I just received the postcard from the NASM concerning the events. They are as follows (weather permitting):
April 17 - Breakfast Reception to watch Discovery fly at the Udvar-Hazy Center. Must be a Mercury Friendship 7 level or higher ($250/year). (Had to upgrade mine to get the invite and only 2 tickets allowed.)
April 20, 2012 - Friday
Special Preview for members of the Museum's National Air & Space Society and their guests. No charge to attend, but advance reservations are required at airandspace.si.edu/membertickets.
If you are interested in meeting there, I will be attending both with my son(s). Can't decide which one to bring. 


