Sweep Tomb

What do we do when Tomb Sweeping Days come?
As far as I know, especially in our region, when tomb sweeping days come, we need to 上坟(visit graves, to honor the memory of the dead). We usually buy a bundle of 冥币(money used for the dead), a few strings of firecrackers. When we come to the front of tombs, we burn the hell money, set off the firecrackers, and dig the soil to cover the tomb with a spade in case the tomb gradually gets small and finally disappears. Afterwards, we knelt on the ground and kowtowed (but now we usually only make three bows instead) and said some words, for instance: dad, tomb sweeping days are coming. I am bringing you some money, please get up and take it, and something like this. After that, we leave the tomb and get home. The sweep tomb activity is finished.