Siyum
A siyum (Hebrew: סִיּוּם, romanized: siyyum, lit. 'completion') is the completion of any established unit of Torah study in Judaism. The most common units are a single volume of the Talmud, or of Mishnah, but other units of learning may lead to a siyyum.
The typical structure of a siyyum includes a conclusion of the study, reading of the Hadran text, kaddish, and a celebratory meal.
The custom to have a siyyum is first mentioned in the Talmud: "Abaye said: grant me my reward, for when I see a young Torah scholar who has completed a tractate, I make a celebration for the rabbis."