Wasn’t sure why this musical specifically was getting a day. There have been other, more long-running shows that don’t have a day as far as I know. Then I read the article.
WICKED is seen by more people each week than any other show, making it Broadway’s most popular musical, partially due to the fact that the Gershwin Theatre is the biggest theatre on Broadway. The theatre is a full city block with 1,926 seats!
If they don’t mean just the most popular musical running now, but the most popular musical period, yeah, makes sense this one is getting a day.