Norton, please keep track of this tread and refresh as the time grows near.A previous post mentioned Kelly's which is right next door to the Dubliner which does have live traditional Irish music. And for the jams, nothing is better than Nanny O'Briens' Monday session. Both are near Metro Stations. Since you were here last, you need to check out the Korean and FDR memorials.
DC is fine for traveling either via cab or the Metro. Note: Keep your eyes open and your wits about you as you wander; "safe" sections transform to "questionable" very quickly.
Ed