A seudat mitzvah (Hebrew: סעודת מצוה, "commanded meal"), in Judaism, is an obligatory festive meal, usually referring to the celebratory meal following the fulfillment of a mitzvah (commandment), such as a bar mitzvah, a wedding, a brit milah (ritual circumcision), or a siyum (completing a tractate of Talmud or Mishnah). Seudot fixed in the calendar (i.e., for holidays and fasts) are also considered seudot mitzvah, but many have their own, more commonly used, names.
Read more about Seudat Mitzvah: Seudat Brit Milah, Seudat Pidyon HaBen, Seudat Bar Mitzvah, Seudat Siyum Masechet, Seudat Nissuin, Seudat Havraah, Seudat Shabbat and Seudat Yom Tov, Seudah HaMafseket, Seudat Purim