Here is a closer look at the milestones and mishaps involving the helium-filled characters that populate the holiday parade.Snoopy, seen in 1999, has appeared in the Macy’s Thanksgiving Day Parade more than any other character.Credit…The New York TimesNov. 20, 2021This article was originally published in 2017. It was updated in 2021.A hippopotamus soared over the…
