Q. Is there a source for the minhag that some people have to give a seuda or a tikun after the unveiling of the matzeiva?

A. Although some, mainly followers of Chasidic traditions do occasionally offer tikun on the day of Hakomas Hamatzeva, it is a most uncommon minhag, not mentioned by Poskim. Horav Shlomo Miller Shlit’a mentioned that he was unfamiliar with this minhag and so were six other Rabbonim in the city.

Rabbi A. Bartfeld as advised by Horav Shlomo Miller Shlit”a