FRIDAY: >> After a superb D.C. debut last year in the back room, Pleaseeasaur is returning to theBlack Cat tonight, this time on the mainstage, opening for San Diego’s Pinback. J.P. Hasson and his invisible sidekick Thomas Hurley III are apparently taking a break this month from recording a new Comedy Central-sponsored album to perform a number of valuable pubilc service announcements. Did you know, for example, that “Cobras are Totally Cool?” Or, for that…