This report began: "The D.C. Council has a full plate for its last legislative session before a two-month summer recess," but since this is the picture they ran with the report—
—I'm not sure the plate was really all that full.
The guy in the suit is a D.C. artist who has painted over 50 imaginary album covers "under the guise of his invented identity as a soul superstar." As for why he dressed up as Spiderman, why not?