Hinduism is the world's oldest religion. Its roots date back to 4000 BC. Hinduism is widely spread out in India and around South-East Asia. Hinduism is a polytheistic religion, believing in many gods. Most of the festivals in Hinduism are centered on one or more gods.
Each of the Hindu festivals are celebrated in a similar manner. They all include chanting prayers to the gods and making sweets or snack items in honor of the gods.
Below are links to several Hindu Festivals.
Above: An Indian woman draws a design called a "Kolum". This design signifies an invitation to the gods to enter the house.