A shindig is an old fashioned American word for a party--and it's very rare to hear anyone use the word today. So, I am letting you know just in case you are wondering.
"The Shindig" is among the weakest of the early Mickey Mouse cartoons because what you'll see is pretty much summed up in the title. There's a big party and Mickey entertains everyone by playing music and everyone dances....PERIOD. this is about the thinnest of plots I've ever seen in a cartoon and despite nice animation, it's sickeningly sweet and boring. The only ones who should be sure to see it are die-hard Mickey fans--otherwise stay clear as there really is nothing to this one.
By the way, although "Walt Disney Treasures - Mickey Mouse in Black and White, Volume Two" is the best available print of these old cartoons, there is a framing issue late in the cartoon. See it and you'll understand what I mean.