India celebrates four main national festivals: Republic Day on January 26th, Independence Day on August 15th, Gandhi Jayanti on October 2nd, and Children's Day. The document also discusses several religious and cultural festivals celebrated in India such as Diwali, Dussehra, Holi, Christmas, Id, and Guruparva. People enjoy spending time with family and friends, wearing new clothes, decorating, giving gifts, praying, and sharing meals during these festivals.