Yizkor, which means to remember, refers to the memorial service that is recited four times a year on major holidays. Traditionally a yahrzeit candle is lit before sunset of the given holiday in honor of the deceased.
Shemini Atzeret- 22 Tishrei, 5781/September 28, 2021
8th day of Passover- 22 Nissan 5782/ April 23, 2022
2nd day of Shavuot- 7 Sivan 5782/ June 6. 2022
Yom Kippur- 10 Tishrei 5783/ October 5, 2022