Washington’s oldest parish in continuous use, Holy Trinity Church celebrated its 225 anniversary — along the school’s 200th — with a sold-out crowd that packed the voluminous Sequoia restaurant in Washington Harbour at the Georgetown waterfront on March 2. Music by Basement Riot amped up the alumni and parents’ crowd and the dancing was on — along with ample food, drink and auction items. Holy Trinity is celebrating during the year and will mark its founder’s day in October.