The School Day of Non-violence and Peace (Dia Escolar de la No-violència i la Pau) was founded by the Spanish poet Llorenç Vidal in 1964 as support for a pacifying and non-violent eucation. This day is observed on January 30 every year, on the anniversary of the death of Mahatma Gandhi in schools all over the world.
To celebrate it in your English class you can use this video about the life of Martin Luther King, a reference of the non-violent struggle for the achievement of human rights.