Guru Nanak Jayanti is one of the most sacred days in Sikhism, celebrating the birth of Guru Nanak Dev Ji, the founder of the Sikh faith and the first of the ten Sikh Gurus. Observances typically include Akhand Path (a continuous 48-hour reading of the Guru Granth Sahib), Nagar Kirtan processions with hymn singing through the streets, and communal langar meals open to all regardless of background. The day honors Guru Nanak's core teachings of one universal God, equality of all people, honest living, and selfless service to humanity.