Q. In my Yeshiva there is dancing on Motzoei Shavuos after Neilas Hachag before Maariv. It starts well after the Z’man. Is it correct to say Hamavdil before dancing or unnecessary?
A. There are different Minhagim and traditions regarding dancing even on Shabbos or Yom Tov itself. As some shuls do when a Chosson - Kalah are present, and all do in the Yom Tov of Simchas Torah.
See question 205 regarding a shul were every Shabbos eve after Kabbolas Shabbos and Maariv there is a rikud, as part of honoring Shabbos. (Some say that on Shabbos Chazon that coincides with Tisha Beav it should not be done, as it constitutes Avelus Befarhasia)
Rabbi A. Bartfeld as revised by Horav Shlomo Miller, Horav Dovid Pam, Horav Aharon Miller and Horav Chanoch Ehrentreu Shlit’a