I'd have to say Wicked: the original cast (even though most of them have departed). I saw this show strictly for the cast. Hanging with the legend Joel himself, Kristin (my all-time favorite), and Norbert (just 'cause he was in The Last Five Years) would be heaven. Not to mention Idina.
But for current Broadway, maybe Dirty Rotten Scoundrels (Norbert again) or Spamalot.
Some people analyze every detail/
Some people stall when they can't see the trail/
Some people freeze out of fear that they'll fail/
But I keep rollin' on/
Some people can't get success with their art/
Some people never feel love in their heart/
Some people can't tell the two things apart/
But I keep rollin' on