Likutei Sichos vol. 7 page 48 ff.When Pesach falls on Shabbos, a Yid won’t carry as we need the Seder even on Shabbos. Likutei Sichos vol. 17 page 71 ff.The three names of Pesach and how they reveal the essence of the holiday (the birth of the Jewish nation) in it’s three requisite steps.

Likutei Sichos vol. 22 p. 114 ff. What Sefiras HaOmer teaches us about Davening and the Siddur.