Martyrdom Day of Sri Guru Arjun Dev Ji is observed on June 18 to commemorate the sacrifice of the fifth Sikh Guru, who was executed by the Mughal emperor Jahangir. Sikhs worldwide participate in this solemn occasion through prayer, kirtan (devotional singing), and community service, particularly by organizing langars, which are free community meals. The day serves as a time for reflection on Guru Arjun Dev Ji's teachings of selfless service and religious freedom. His martyrdom is seen as a pivotal event that underscored the Sikh commitment to justice and faith. The observance highlights the importance of his contributions, including the construction of the Golden Temple and the compilation of the "Guru Granth Sahib," which contains the writings of all past Gurus.