"Yom Kippur is on Shabbat this year."

"I once heard that kreplach enables cheaper cuts and mince to be served in a bekovede way which was necessary in der alter heim when poverty-stricken Yidden wanted to serve meat on semi-Yomtovim like erev Yom Kippur, Hoshanah Rabbah and Purim." (source)

"If Yom Kippur comes in at 6:15, we'd better start the meal at 4:45." (Glinert)