Different shows will no doubt have some variations  , but check out this page from the Houston IPMS show for an idea of the basic requirements for entry .

  Personally  , I've never seen models handled at all during judging  .   I honestly can't think of a reason for it .

    

       http://www.ipms-houston.org/wp-content/uploads/2011/11/ModelMania-Pamphlet-2016-ver-07.pdf

     ..... . you probably need to move this to a different section