Matt Magnusson as Bobby Darin in 'Just In Time' Matthew Murphy and Evan Zimmerman Broadway box office pretty much held steady last week with the 31 productions more or less settling into the post-holiday/pre-spring groove, though there was one big exception: Proving the star power of Jonathan Groff (as if proof were necessary), the weekly gross for Just In Time took a walloping 63% nosedive with the star’s pre-scheduled one-week vacation. Though the Bobby Darin jukebox musical, with understudy Matt Magnusson playing the lead character (word of mouth is he’s terrific), still filled 92% of Circle in the Square’s seats, the average ticket price dropped from the previous week’s $256.58 to $106.72. The show’s weekly gross fell $911,970 from the previous week to $544,378.