Will the Hui people go to the grave on the seventh day?

On the seventh day, the Hui people went to sweep the grave. Every seven, twenty-seven, thirty-seven, forty days, one hundred days, anniversary and three years after death, we will go to the grave and bury it in order to save the dead and express our memory of the dead. Hui people attach great importance to the cemetery, fishing or fencing off, it is forbidden to build animal pens and toilets around the cemetery, and no one is allowed to urinate in the cemetery.