happy? Rejoice!
When you have the privilege of holding a mitzvah meal (such as a Brit Milah [circumcision ceremony], a Bar Mitzvah or a wedding), we are charity driven to fulfill for you the wonderful virtue of preparing a meal for the poor on the event day. The poor dine with dignity, in a place they are accustomed to.
According to the Book of Zohar, every joyous occasion has a man with ill intentions coming to disrupt, but if the event holder makes a meal for the poor, that disrupter walks away and stops disrupting. The right to a meal is a form of defense and acts for great salvation, as was said: “Feed me and I shall be salvaged.”