Rebbe Nachman of Breslov's histalkus [ascent from the body] took place in Uman, a Ukrainian town in Kiev oblast, on the 18th of Tishrei, which is the second day of Chol HaMo'ed Succos, 5571 [Oct. 16, 1810]. According to his express wish, Rebbe Nachman was buried in the old Jewish cemetery, together with more than 20,000 martyrs of the Haidamack massacres of 5528 . His surviving family members included his second wife, who built over his grave the original Ohel [a wooden structure to accommodate those who wished to pray nearby]; his daughters Adel, Sarah, Miriam, and Chaya; and several grandchildren. According to one tradition, the Rebbe's father, Rabbi Simcha, survived him, as well.
It is customary for Breslover Chasidim to gather together on "Chai Tishrei" in order to commemorate the Rebbe's Yahrzeit. As is commonly the case in the Breslov community, there are no special minhagim [customs] associated with this event, other than lighting a Yahrzeit candle, giving Tzedakah [charity] in Rebbe Nachman's memory, and engaging in the study of Rebbe Nachman's writings.
Video: Rabbi Chaim Kramer speaks about Rebbe Nachman