Rabbi Elazar Muskin, senior rabbi of Young Israel of Century City in Los Angeles and vice-president of the Rabbinical Council of America, is scholar in residence at Congregation Beth Aaron. On Shabbat morning he will speak after davening in the main minyan. At 5:40 p.m. he will discuss “When Unity Reigned: Yom ha-Atzma’ut 1954,” and after Mincha at 6:40, on “Strictly Confidential? History vs. Halacha.” 950 Queen Anne Road. (201) 836-6210.