Eid-Al-Adha Coincides with Parshat Vayeira This Year
The Muslim holiday of Ein-Al-Adha, which commemorates Ibrahim's alleged willingness to sacrifice his son Ishmael to Allah according to Muslim tradition, coincides with Parshat Vayeira this year. Parshat Vayeira, as many know, is the Parasha in which Avraham Avinu is willing to sacrifice Yitzhak Avinu on Mount Moriah. In fact, it was Yishmael who was left behind with the donkey to whom he was compared.
This convergence is a rare occurrence due to the fact that the Muslim calendar is solely lunar-based. I don't know what the significance of this is, but I have a guess.
The last few times this occurred (based on the United States commemoration of this holiday):
Nov 7, 1848
Oct 23, 1882
Nov 10, 1913
Oct 19, 1915
Nov 5, 1946
Oct 20, 1980
Nov 7, 2011