Joshua Radin @ 6&I on 11/17
http://www.joshuaradin.tickets.musictoday.com pre-sale for DC is on.
And...what I interpret from his tweet - Watson Twins are opening the second half of his tour in the fall...I would think that means the DC show is included, considering the shows in Boston (11/22), NYC (11/2) claim WT will be w/ him. (Not on 6&I, WT, or LN sites from what I could tell.)
Although, I can't find info to support they will be in DC too, I enjoy him so I picked up a ticket.
(Approx $30 w/ processing and mailing fees, which is a bummer b/c musictoday is generally cheaper, charging about $1 extra and/or free at will call.)