What happens when one is saved from a tragedy where other people were not as fortunate. Does this affect the celebration. For example, does one forgo the festive meal? Maybe only publicly?
Are there some kind of guidelines about how to celebrate in such a circumstance.
One example I can think of is someone who survived the collapse of the World Trade Center buildings on September 11, 2001. How is his celebration halachically affected by the deaths of others while he was saved?