“Back to Shul” Open House, Happy Hour and Musical Kaballat Shabbat: Friday, August 26 at 5:00 pm. Open House and Happy Hour from 5:00 - 6:00 pm, followed by musical Friday evening services at 6 pm. Join the Sinai community as we welcome Shabbat together at our “back-to-shul” event. You can also bring your family, friends, neighbors, grandparents and cousins and introduce them to Sinai!