Can I go to someone else's house in July 15?

From a scientific point of view, people can go to other people's homes on 15, but China people can't go to other people's homes on 15, because the traditional concept of China people is that they will "meet" ghosts when they go out.

The fifteenth day of the seventh lunar month is the Mid-Yuan Festival in Taoism and the Yulan Basin Festival in Buddhism. Now it is called Ghost Festival among the people. In the traditional concept of China people, July and a half coincides with the alternation of summer and autumn. At this point, it is precisely the node where yin and yang alternate between heaven and earth. Yang qi rises and falls, and Yin qi appears. On this day, the underground palace opens the gates of hell and releases ghosts, so the activities of offering sacrifices to ghosts are generally held.

Later generations also said that the whole lunar July should be "Ghost Festival". On the first day of the seventh lunar month, the prince of Yan opened the gate of hell, released ghosts for the dead to eat and enjoyed people's offerings. On the last day of July, the ghost gate closed again, and the ghosts were going back to the underworld.

Extended data:

The custom of ancestor worship in July and a half has existed since ancient times. It was originally a folk festival to worship ancestors, not a "Ghost Festival". The core of July and a half culture is filial piety, and the festival of ancestor worship is generally not called "Ghost Festival". The ancestor worship festival in July and a half is called "Zhongyuan Festival", which originated from Taoism after the Eastern Han Dynasty (about the Northern Wei Dynasty).

Legend has it that on the day of the Yuan Dynasty, the underground palace opened the door of hell, which was also the day when hell opened the door. All ghosts have to leave the underworld to take the entrance examination, and those who have owners go home, and those who have no owners wander around the world looking for food. Therefore, it is also known as the Ghost Festival, and generally holds activities of offering sacrifices to ghosts and lights lanterns to show the way home for the dead. Taoist temples hold dharma meetings, and Taoist priests make prayers, the content of which is to cross over the dead.