1. The Illumination of Divine Light: Prakash Utsav
Every year on the full moon day of the lunar month of Katak (**Katak Puranmashi**, celebrated on November 24, 2026), millions of Sikhs and spiritual seekers worldwide commemorate the most sacred milestone in Sikh theology: Guru Nanak Jayanti (reverently celebrated as *Gurpurab* or *Prakash Utsav*—the "Advent of Divine Light").
The festival marks the birth of **Guru Nanak Dev Ji (1469–1539 CE)**, the first Sikh Guru and the visionary founder of Sikhism. Born in 1469 at Rai Bhoi Di Talwandi (modern-day **Nankana Sahib**, Pakistan), Guru Nanak revolutionized Indian spiritual thought by challenging rigid ritualism, caste discrimination, and religious sectarianism. Following his transcendental revelation in the waters of the Kali Bein river at Sultanpur Lodhi, he proclaimed the foundational axiom of universal brotherhood: *"Na koi hindu, na koi musalman"* (There is no Hindu, there is no Muslim, only one divine humanity).
Guru Nanak synthesized Sikh philosophy into three revolutionary pillars: **Naam Japna** (incessant remembrance and chanting of the One Formless Divine, *Ik Onkar*), **Kirat Karo** (earning an honest, dignified livelihood through hard work), and **Vand Chhako** (selflessly sharing one's earnings, meals, and resources with the needy). Accompanied by his lifelong Muslim companion **Bhai Mardana** playing the stringed *Rabab*, Guru Nanak embarked on four monumental walking odysseys (**Udasis**) traversing over 28,000 kilometers across India, Tibet, Sri Lanka, Mecca, Medina, and Baghdad to spread the message of divine love, humility, and moral righteousness.