The Rebbe urges organizing gatherings around Yud-Tes Kislev to strengthen the dissemination of Chassidus, Torah study, mitzvah observance, and character refinement. He highlights the Baal Shem Tov’s teaching that spreading these wellsprings prepares the world for Mashiach and blesses the recipient with success in this mission.
https://www.torahrecordings.com/rebbe/004_igros_kodesh/kislev/820