Guru Granth Sahib Jayanti, also known as Guru Gaddi Diwas, is a significant Sikh holiday that commemorates the installation of the Guru Granth Sahib as the perpetual Guru of the Sikhs. This event took place on October 20, 1708, after Guru Gobind Singh, the tenth Sikh Guru, declared the Guru Granth Sahib as the final and everlasting Guru for the Sikh faith.