Do you mean that you are going to add soil to the grave of your deceased grandfather on May 1 this year?

There are generally four solar terms (the lunar calendar) when going to the grave, namely, Tomb-Sweeping Day, July 15th, the first day of October, and New Year's Eve (in some places, it is 30th). These are traditional ghost festivals, that is, when ghosts come out every year, other anniversaries and festivals are also to be visited!

It's not convenient to go to the grave far away, so just enter the filial piety. When the solar term is inconvenient to burn paper, you can provide photos to burn paper at home, or draw a circle at the intersection, write the name of the deceased, and call the name of the deceased at the same time, so that your deceased can get the money according to the statement. If you don't write your name or shout your name, other ghosts will take the money, and your undead won't receive it!