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Last minute, need Nerf type game for grade school Mother-Son event.

 Theme is sports & movies but most events are simple, not really following theme.  My task/direction was to supply a few guns and tape a target on bleachers/wall.  Is that boring enough for you?
I'd like to do something more...any ideas?

(I had thought about 'How to Train Your Dragon' and 'Harry Potter'...and using Nerf guns as "training"- or Nerf swords to do something...Help.