Who is Tomb-Sweeping Day commemorating?

Tomb-Sweeping Day, Tomb-Sweeping Day, also known as Walking Festival and March Festival. Tomb-Sweeping Day is a solar term and a festival. This is the most important festival to sacrifice ancestors and sweep graves. Cold food festival, commemorating the meson push of Jin State in the Spring and Autumn Period. When the meson was pushed to death, it was the day before Tomb-Sweeping Day. Because he survived the fire, people in the state of Jin ate cold food and didn't set off fireworks on the day he died in memory of him. Later, people simply named it "Cold Food Festival". In the Tang Dynasty, the Cold Food Festival merged with Tomb-Sweeping Day.