One that has the family tradition to fast on the day of the Yohrzait of a dear one. If the first Yohrzait day is this coming Friday ‘Tu Beav’; Does he fast? If he does not, is it proper to make a Siyum and a Seuda?

Mishna Berura (573: 7) quotes Magen Avrohom who rules that usually in a day when no Tachanun is recited, one does not fast either, and it includes Tu B’av. There is a minhag by some to make a Seuda during Tu B’av (Karlin Beis Aharon and others. See Nitei Gavriel 98: 7).