I recall seeing an episode of Wild West Technology on the History Channel about the sideshow / freak shows of the old time carnivals and traveling circuses. Too bad they didn't do something like this at DCA.
Now I know it is very un-PC to have an actual freak show (I love Zamora the Torture King at Knott's Scary Farm, but maybe watching a man shove needles into his arms and face is a little too much for a Disney crowd). But what about bring back to life Dumbo's Circus, an area that was designed around the time of Discovery Bay and some of the model's were on display in the Opera House during the 50th. I realize that AA type shows (a la Country Bears and America Sings) seem to be a thing on the past at Disneyland, but it would fit the theme.
Or how about an up dated version. Build a big top style theater. Then hire performers with various talents and skills to do a live stage show. Acrobats, jugglers, stunt men, chinese style acrobats, magicians, contortionists. You could always change the line up to keep the show fresh. There are all sorts of performers with unique and facinating skills and talents that travel the country. Book these people and put on a side show. Then to throw a Disney element, add a couple AAs or life like advanced puppets of Disney characters to add some humor to the show by demonstrating their "special skills" (use some of the characters from Dumbo's circus, like Horace Horse Collar, the Rubberband One Man Band, etc). I remember the high light of the Mulan parade years ago were the Chinese acrobats. They got the loudest cheers. Again, with a constantly revolving line up, this show would always stay fresh.