Tom Hanks, Paul Giamatti and author David McCullough are among special guests who'll attend a private premiere screening of the upcoming HBO Films mini-series "John Adams," on March 11 at the National Constitution Center. Giamatti, who filmed M.Night Shyamalan's "Lady in the Water" here, stars in the series, based on McCullough's Pulitzer prize-winning book, and "Philadelphia" star Hanks is an executive producer, along with Gary Goetzman, who will also be on hand. Homeboy David Morse also co-stars in the series, as George Washington, but is not currently slated to attend. Comcast is also a sponsor of the event, and chairman Brian Roberts will be there and a host of Pennsylvania lawmakers are also on the invite list. The first two parts of the seven-part series debut on HBO at 8 p.m. Sunday, March 16. Episodes continue airing each at 9 p.m. each Sunday through April 20.