This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. A small show offered in addition to the main attraction, as at a circus.

n. A diversion or spectacle that is incidental to a larger set of circumstances or a bigger issue of concern: "Administrations with little room to maneuver at home have historically looked for sideshows abroad” ( Joan Didion).

n. A minor attraction at a larger event such as a circus, fair, music festival or similar.

n. a minor show that is part of a larger one (as at the circus)

n. a subordinate incident of little importance relative to the main event

"Another sideshow is the battle for the green points jersey."

show    incident   

carny    side-show    wowser    crazy-eyed    law    contortionist    smorgasbord    plussome    funhouse    birch-rod