First Grand Concert by the Independence Assembly to be Given at Girard Hall, S.W. Cor. Sixth St. and Girard Avenue, on Friday Ev'ng, March 20, 1863 on which Occasion the Philadelphia Minstrels are Engaged and Will Appear. ... Comic Act--Post Office Sam! ... Comic Act--Surprise Party ... The Performances Will Conclude with the Laughable Ethiopian Sketch, Written by Andy Williams, Entitled The Musician! ... Admission, 25 Cents. Doors Open at Half-past 6. Performance to Commence at Quarter of 8 Front Seats Reserved for Ladies. Polite Ushers Will be in Attendance