There will be a farbrengen at Tzemach Tzedek in honor of Yud Beis Tammuz this Thursday night, June 20, following the 9:30 PM Maariv minyan.
Yud Beis Tammuz commemorates the birth date of the Freidirker Rebbe as well as the day that he was officially granted release from his sentence of exile to Kastroma in the interior of Russia.
Twenty-seven days earlier, the Rebbe had been arrested by agents of the GPU and the Yevsektzia ("Jewish Section" of the Communist Party) for his activities to preserve Judaism throughout the Soviet empire and sentenced to death, G-d forbid.
International pressure forced the Soviets to commute the sentence to exile and, subsequently, to release him completely.
The actual release took place on Tammuz 13, and Tammuz 12-13 is celebrated as a "festival of liberation" by Chassidim.