Sadh Sangat ji you are informed about the Bandhi Chor Diwas (also called Diwali) celebrations to be held in Gurdwara Sahib Oxford following Rehras Sahib and Kirtan. Come join and celebrate the night with lights & sound.
'Bandhi' means Prisoner and 'Chor' means Release, so this day is celebrated by sikhs because it rejoices the time when the sixth Sikh guru, Guru Hargobind Singh ji was released from His imprisonment alongwith 52 prisoners from the fort of Gwalior.
More here -> http://www.sikhiwiki.org/index.php/Bandi_Chhorh_Divas