Thanks to all for your replies. I will leave my revolver at home. My nephew is graduating from law school in Georgetown. I plan to enjoy my visit there but I dislike being anywhere I can't carry. I guess I am paranoid.

However, I had an "issue" about four years ago in a grocery store parking lot. I experienced another "issue" last year in a bank lobby. I did not need to deploy my revolver in either situation but I found it's presence extremely comforting. During the bank "issue", I got to see some bank employees looking and acting very uncomfortable until law enforcement showed up. Evidently the drive up tellers were trained to look for trouble headed their way from the parking lot. I was amazed at how fast they could lock the place down.