Guru Nanak Jayanti marks the birth anniversary of the first Sikh guru, Guru Nanak. It is one of the most sacred festivals in Sikhism and observed with various celebrations. It is also known as Guru Nanak's Prakash Utsav and Guru Nanak Dev Ji Jayanti. It is also known as Guru Nanak's Prakash Utsav and Guru Nanak Dev Ji Jayanti.