At the Renwick Gallery near the White House, the exhibit "Going West! Quilts and Community" has a Comics Quilt, circa 1935, with a bunch of comics characters sewn into it. It's on loan from the Stuhr Museum of the Prairie Pioneer.
Another option would be the Uncle Scrooge and Carl Barks show that opened right before Christmas at Geppi's Entertainment Museum. I plan on seeing that in January myself.