After Diwali, Holi is the biggest festival in North India. Weeks before Holi, families plan for shopping, renovation of the house, dinner, lunch and breakfast menu and also for paying a visit to relatives and friends. In many cities of north India, such as Vrindavan, Banaras and Kanpur, Holi is a fortnight long festival. It starts about a a week before Dhulendi and ends with Ganga Mela (a festival very specific to the state of Uttar Pradesh).
In other parts of North India its a two days long celebration. First night of Holi is the celebration of End of the Evil. Families gather around the fire in circle and offer Sugarcane, Green Gram and other seasonal crops to the fire. People also throw Gulaal - colorful podwer, Gujia - Sweets and Pop-corns in the fire. The reason behind this is mostly unknown. According to the Hindu mythology, the fire is considered holy and everything becomes pure after going through fire. Throwing food items in fire could be a symbolic act to make the food items pure and free from any evil till next Holi celebrations.