A child poses for photos with a pumpkin to celebrate the Halloween on a street in San Mateo, California, the United States, Oct. 31, 2019. (Photo by Li Jianguo/Xinhua)

People dress up to celebrate the Halloween on a street in Berkeley, California, the United States, Oct. 31, 2019. (Photo by Li Jianguo/Xinhua)

A girl dresses up to celebrate the Halloween on a street in Berkeley, California, the United States, Oct. 31, 2019. (Photo by Li Jianguo/Xinhua)

A man dresses up to celebrate the Halloween on a street in San Mateo, California, the United States, Oct. 31, 2019. (Photo by Li Jianguo/Xinhua)

People dress up to celebrate the Halloween on a street in Berkeley, California, the United States, Oct. 31, 2019. (Photo by Li Jianguo/Xinhua)

A girl poses for photo with a pumpkin to celebrate the Halloween on a street in San Mateo, California, the United States, Oct. 31, 2019. (Photo by Li Jianguo/Xinhua)

Children dress up to celebrate the Halloween on a street in Berkeley, California, the United States, Oct. 31, 2019. (Photo by Li Jianguo/Xinhua)

A girl is made up to celebrate the Halloween on a street in San Mateo, California, the United States, Oct. 31, 2019. (Photo by Li Jianguo/Xinhua)