Are you supposed to do the responsive parts of Hallel at the Seder? indicates that, when three men are at the seder, Hallel is recited responsively. At the seder, does one recite Hallel responsively ...
Two groups split into 2 cars and eat bread while travelling. What type of zimun do they make after rejoining?
This article delves into some details on what constitutes "eating together" for the requirement of zimun. I see that there is a dispute regarding what happens when some people leave in the middle or ...