Participants wearing masks during a hazy day at the Beijing International Marathon in front of Tiananmen Square, in Beijing, October 19, 2014. (Photo by Reuters/Stringer)

A girl participates in a New Year calligraphy contest in Tokyo, Japan, January 5, 2017. (Photo by Kim Kyung-Hoon/Reuters)

A participant in costume uses a mobile phone at a Halloween event in Kawasaki, south of Tokyo, Japan October 29, 2017. (Photo by Kim Kyung-Hoon/Reuters)

A participant runs through foam during the Love Foam Run race in Hsinchu, Taiwan May 29, 2016. (Photo by Tyrone Siu/Reuters)

A couple participates in the “Running of the Brides” race in a park in Bangkok, Thailand on March 25, 2017. (Photo by Athit Perawongmetha/Reuters)

People participate in the 36th annual Mermaid Parade in Coney Island on June 16, 2018 in New York City. (Photo by Stephanie Keith/Getty Images)

A participant takes part in a “Zombie Walk” parade in Kiev, Ukraine on October 27, 2018. (Photo by Gleb Garanich/Reuters)

A participant wearing a costume and make-up attends a Halloween parade at Walibi park in Wavre, Belgium, October 25, 2019. (Photo by Yves Herman/Reuters)