SIDESHOW
sideshow
(noun) a minor show that is part of a larger one (as at the circus)
sideshow
(noun) a subordinate incident of little importance relative to the main event; “instruction is not an educational sideshow”
Source: WordNet® 3.1
Etymology
Noun
sideshow (plural sideshows)
a minor attraction at a larger event such as a circus, fair, music festival or similar
an incidental spectacle that diverts attention from a larger concern
(US) an incident in which drivers block traffic to perform donuts for an extended period of time
Antonyms
• main attraction
Source: Wiktionary