DC area knitting

   Spur of the moment I am going to head to DC friday morning to visit my brother who is also an avid knitter and just moved back there after being gone a few years.  I was hoping anyone here could point out good yarn shops in that area or event/gathering going on.  the plan at this point is to simply Sit, Sip, Knit, repeat. in that order of course.  any pointers would help! thanks.

P.S.-  I will be staying in

P.S.-  I will be staying in the Glover park area (near georgetown?) if that narrows it down a bit