The same thing applies to the Sesame Street Muppeteers in the Macy's Thanksgiving Day Parade. Imagine Caroll, Kevin, Leslie, Marty, Carmen, and a bunch of other lesser-known/apprentice puppeteers squeezed into that SS float for over three hours with their hands above their heads. Kevin even recalled losing his voice after playing Cookie Monster at Macy's TP back in 1979 or 1980. It must be exhilarating, but also exhausting.
But I digress. As for Ruhanna's idea about the plot, here's my take on the whole entire plot. WARNING: Not the final plot, just my own idea.
So Kermit & the gang take their show around the world (based on what we see in the promo poster). When they stop in London, they get tangled up in Constantine's evil plot to take over the world. Trouble is, he looks like Kermit and woos Miss Piggy behind Kermit's back. When Miss Piggy tells the real Kermit about the wedding, he flips out and is totally confused. Soon, Constantine is about to marry Piggy and Kermit ends up behind bars, being mistaken for Constantine. His Muppet friends are in jail too, being mistaken for partners in crime. Somehow, Kermit escapes...maybe with help from Danny Trejo and Animal...eating the bars?
Then the whole Muppet gang races to the cathedral and Kermit finally declares his love for Piggy. Constantine gets taken down in some Muppety fashion (an explosion by Crazy Harry, perhaps?), and then the real Kermit gets hitched to Miss Piggy.