There is an ancient custom to celebrate the completion of studying a Jewish text, such as a tractate of Talmud or Mishna, or even a chapter, or any other significant unit of study.
Such a celebration is called a “siyum”, which means “completion.” Ideally, it should include a celebratory meal.
At a siyum, one of the celebrants reads the last few lines of the text being completed, and explains it. Others may speak as well. Then one or more of the celebrants reads aloud the “Hadran”. If there is a minyan present, a special Kaddish is said.
Hadran for a siyum
Link to Kaddish (coming soon)