a minor show or exhibition in connection with a principal one, as at a circus.
any subordinate event or matter.

1840–50, Americanism Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
sideshow (ˈsaɪdˌʃəʊ)
1.  a small show or entertainment offered in conjunction with a larger attraction, as at a circus or fair
2.  a subordinate event or incident

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1855, apparently a coinage of P.T. Barnum's, from side + show (n.).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Sideshow is my one-stop shop for great random gifts.
Worthy and important, of course, but a sideshow to another of the events that
  is taking place this month.
For years, this software commons was no more than an obscure sideshow.
Aside from the pursuit of war and some shifting definition of victory,
  everything else is a political sideshow for him.
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