This entry details the customs for 29 Elul, the eve of Rosh Hashanah: Selichos at dawn, no Tachanun, Hataras Nedarim with a minyan, Eruv Tavshilin, and the birthday of the tzt"z. It concludes with a teaching from the Alter Rebbe on the preciousness of a Jewish body.
https://www.torahrecordings.com/hayom-yom/013/029