The Collaborative International Dictionary of English v.0.48:

Theatricals \The*at"ric*als\, n. pl.
   Dramatic performances; especially, those produced by
   amateurs.
   [1913 Webster]

         Such fashionable cant terms as `theatricals,' and
         `musicals,' invented by the flippant Topham, still
         survive among his confraternity of frivolity. --I.
                                                  Disraeli.
   [1913 Webster]