Yizkor, the traditional memorial prayer, is said four times per year on the following holidays:


YOM KIPPUR afternoon
Shemini Atzeret (End of the SUKKOT holiday)
End of PASSOVER
End of SHAVUOT


Dates for 2011-12

October 8, 2011
October 20, 2011
April 13, 2012
May 27, 2012