Q. See question above. Can one on the Shabbos Yohrzait attend a Bar Mitzva kidush after davening?
A. Nitei Gavriel (p. 176- 24 -4) and other Poskim maintain that on a regular Kidush one is allowed. However, if it is an occasion of a very happy Simcha occasion, then one in Yohrzait should abstain.
Rabbi A. Bartfeld as revised by, Horav Yaakov Hirschman, Horav Dovid Pam, Horav Aharon Miller, Horav Chanoch Ehrentreu and Horav Kalman Ochs Shlit'a