As an AI language model, I do not have the ability to check if a specific business, such as a casino, is open on a particular day. However, most casinos are open on Christmas Day, as they are considered an essential business in many areas. Additionally, many casinos offer special holiday promotions or events during this time to attract customers. If you're looking to visit a specific casino, it's always best to check their website or contact them directly for the most up-to-date information.