Q. If someone has Yohrzait on Asara Beteves and wants to make a Siyum, should he make it on the night of Assara Beteves, or maybe in the night after the fast ends?
A. Horav Shlomo Miller’s Shlit’a opinion is that he should make the Siyum on the night before, since it is after all the day of the Yohrzait.
Rabbi A. Bartfeld as revised by Horav Dovid Pam, Horav Aharon Miller and Horav Chanoch Ehrentreu Shlit'a