Congregation Beth Shalom offers an interactive improvisational service as part of the shul’s monthly “Lab Shul” series of experimental davening. This service hopes to bring the people together interactively not using a siddur, but improvising with rhythm and niggunim, in the style of singer Bobby McFerrin. 21 Passaic Ave. Rabbi David Bockman, Bockmonides@gmail.com, (973) 835-4845.