Why Will All Holidays, Besides Purim, Be Nullified in the Future?

Maamar Purim 5716 #1: This text-based class, the first in a series, teaching a Maamar, a Chassidic discourse by the Lubavitcher Rebbe which he presented at a Farbrengen, on Sunday, Purim 5716, February 26, 1956, was taught by Rabbi YY Jacobson on Monday, Parshas Pekudei, 1 Adar II, 5784, March 11, 2024, at Bais Medrash Ohr Chaim in Monsey, NY. The class explores what it means that Purim is the only holiday that will not be nullified when Moshiach comes, and why there is argument about the status of Yom Kippur following the redemption.