Qingming or Tomb Sweeping Day is a day dedicated to paying respect to family ancestors. The holiday usually falls in April and on the 15th day of the spring equinox. Families travel to their ancestors’ graves to clean the sites, plant new flowers, pay respects and to offer food.

FYI,

https://www.uic.edu/orgs/cwluherstory/CWLUArchive/interwomen.html