My son and I met him at the Home Depot in Fairfax, back around May when the Nats were playing real good ball. He was just a super nice guy, didn't rush us at all, and we were first in a growing line.
He indicated he had been to a few Nats games already, incognito. So keep your eyes open, you never know when a Hall of Famer might be sitting right next to you.
Also, he had a stack of color photos to sign and give away, of him in Senators uniform, taken in Griffith Stadium.