Based on the search results, it is not clear which Hindu festival is being celebrated today, October 31, 2023. However, there are several Hindu festivals and important days listed in the search results for the month of October and November 2023, including:

• Karwa Chauth: November 1, 2023
• Dhan Teras: November 10, 2023
• Diwali: November 12, 2023
• Bhai Dooj: November 14, 2023
• Chhath Puja: November 19, 2023
• Kartik Poornima: November 27, 2023

It is important to note that the Hindu calendar is lunar and the dates of festivals and important days can vary from year to year.