To mark this day, people often light up earthen diyas across their homes and at selected temples to spread light, love and happiness. Interestingly, the observance of Karthikai Deepam is also a common practice around the same time. However, Karthikai Deepam is only marked when the Karthigai Nakshatra begins. Karthikai Deepam 2023 will be celebrated on November 26 this year.