Callender originally mounted “Harry Potter and the Cursed Child” as a two-night, five-hour-plus stage spectacular in 2018, but when he returned the show to Broadway’s Lyric Theatre in December 2021, the version for post pandemic had been pared down to a still spectacular three and a half hours. That “single play” version has since opened in Melbourne, Toronto and Tokyo, while the original two-parter continued on in Hamburg, Germany, and London’s West End. An Emmy winner for 1982’s “The Life and Adventures of Nicholas Nickleby,” Callender in 2022 launched new seasons of TV shows he produced: “Dangerous Liaisons” (Starz), starring Lesley Manville and Carice van Houten; Peter Kosminsky’s “The Undeclared War” (Peacock/Channel 4), with Simon Pegg and Mark Rylance; and James Herriot’s “All Creatures Great and Small” (Masterpiece on PBS/Channel 5).