Which of the following is NOT a component of the Hindu ritual calendar?

Christmas is not a component of the Hindu ritual calendar because it is primarily a Christian holiday that celebrates the birth of Jesus Christ. In contrast, Diwali, Holi, and Pongal are significant festivals within Hinduism, each with their own unique rituals and cultural importance.

Diwali, known as the Festival of Lights, celebrates the victory of light over darkness and good over evil. Holi, the Festival of Colors, marks the arrival of spring and is celebrated with vibrant colors and joyful festivities. Pongal is a harvest festival celebrated in the Tamil Nadu region, dedicated to the sun god and giving thanks for the harvest. Each of these festivals is deeply rooted in Hindu traditions and practices, making Christmas an outlier in this context.