Relatives and supporters of Benigno "Ninoy" Aquino Jr. celebrate mass for the 40th Anniversary Commemoration of the Martyrdom of Ninoy at Sto. Domingo Church in Quezon City on Monday, Aug. 21.br br The country observes Ninoy Aquino Day annually on Aug. 21 to commemorate the assassination of Senator Benigno "Ninoy" Aquino Jr. (MB Video by Noel B.