Guru Nanak Dev Ji Gurpurab (Punjabi: ਗੁਰੂ ਨਾਨਕ ਗੁਰਪੁਰਬ ), also known as Guru Nanak's Prakash Utsav (ਗੁਰੂ ਨਾਨਕ ਦਾ ਪ੍ਰਕਾਸ਼ ਉਤਸਵ), celebrates the birth of the first Sikh guru, Guru Nanak. One of the most celebrated and important Sikh gurus and the founder of Sikhism, Guru Nanak Dev is highly revered by the Sikh community. This is one of the most sacred festivals in Sikhism, or Sikhi. The festivities in the Sikh religion revolve around the anniversaries of the 10 Sikh Gurus. These Gurus were responsible for shaping the beliefs of the Sikhs. Their birthdays, known as Gurpurab, are occasions for celebration and prayer among the Sikhs. Background Guru Nanak, the founder of Sikhism, was born on Puranmashi of Kattak in 1469, according to the Vikram Samvat calendar in Rai-Bhoi-di Talwandi in the present Shekhupura District of Pakistan, now Nankana Sahib. It is a Gazetted holiday in India. According to the controversial Bhai Bala Janamsakhi, it claims Guru Nanak was born on the Full Moon (Pooranmashi) of the Indian Lunar Month Kartik. The Sikhs have been celebrating Guru Nanak's Gurpurab around November for this reason and has it been ingrained in Sikh Traditions. However, some scholars and organizations believe the Birthday should be celebrated on Vaisakhi, which falls on 14 April according to the original Nanakshahi Calendar passed by Sri Akal Takht in 2003. However, many people and organizations would like to keep the traditional date by celebrating on the Full Moon Day (Pooranmashi or Purnima) of the Lunar Month Kartik. The original Nanakshahi Calendar follows the tradition and celebrates it on Kartik Purnima due to demands by various Sikh Saints. Significance Guru Nanak Dev preached that any person could connect to God by worshipping with clear conscience. His teachings are included in Guru Granth Sahib. The festival The celebration is generally similar for all Sikhs; only the hymns are different. The celebrations usually commence with Prabhat Pheris. Prabhat Pheris are early morning processions that begin at the Gurudwaras and proceed around the localities singing hymns. Generally, two days before the birthday, Akhand Path (a forty-eight-hour non-stop reading of the Guru Granth Sahib, the holy book of the Sikhs) is held in the Gurdwaras. The day prior to the birthday, a procession, referred to as Nagarkirtan, is organised. This procession is led by the Panj Pyaras (Five Beloved Ones). They head the procession carrying the Sikh flag, known as