1) On Motzei Shabbos immediately following Shemoneh Esrei of Maariv we recite the Tefillah of Vayehi Noam. Whenever Pesach, or any Yom Tov, (which prohibits work) falls on a weekday the paragraph of Vayehi Noam which is normally said after Shabbos, is omitted. (Rama 295)
2) This year, Pesach takes place on Friday night. The question is whether one should recite Vayehi Noam on the previous Motzei Shabbos (after Shabbos Hagadol). According to the Mishnah Berurah (295 Shaar Hatzion 5) one should recite Vayehi Noam. However, the custom of Yerushalayim (Vayitzchak Yikareh on M.B.) is not to recite Vayehi Noam this Motzei Shabbos, since Erev Pesach occurs on Friday and certain restrictions against work are in effect on Erev Pesach after Chatzos. This is also the view of Rav Moshe Feinstein zt”l (Shmatisah D’Moshe page 345). For normative Halacha a rabbi should be consulted.