The perfect task for all the inhabitants to do together would be to form an unruly mob. So you have all the townsfolk all come together and light torches and wave pitchforks and other assorted weapons and just march around Springfield together. That would be far cooler than them all disappearing inside a building.
The icing on the cake would be if Homer or Bart or Kang had a related task of running from angry mob, with the mob chasing them. Kang actually already has the perfect animation for that as you can just use his run away from puny humans animation.
