Children pose with pumpkins at Irvine Regional Park in Irvine, California, the United States, Oct. 19, 2019. A series of activities were held at Irvine Regional Park to celebrate the upcoming Halloween. (Xinhua/Li Ying)

A girl decorates a pumpkin at Irvine Regional Park in Irvine, California, the United States, Oct. 19, 2019. A series of activities were held at Irvine Regional Park to celebrate the upcoming Halloween. (Xinhua/Li Ying)

A family poses with pumpkins at Irvine Regional Park in Irvine, California, the United States, Oct. 19, 2019. A series of activities were held at Irvine Regional Park to celebrate the upcoming Halloween. (Xinhua/Li Ying)

A girl shows a decorated pumpkin at Irvine Regional Park in Irvine, California, the United States, Oct. 19, 2019. A series of activities were held at Irvine Regional Park to celebrate the upcoming Halloween. (Xinhua/Li Ying)