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mega-exhibition
mega-exhibition n.
Brit. 
/ˈmɛɡə(r)ɛksᵻˌbɪʃn/
, /ˈmɛɡə(r)ɛksᵻˌbɪʃn/U.S. /ˈmɛɡəˌɛksəˌbɪʃ(ə)n/
/ˈmɛɡəˌɛksəˌbɪʃ(ə)n/ΚΠ
1984 N.Y. Times 4 Nov. ii. 1/3 ‘Mega-exhibitions’ is the coinage in question, and let us hope that it sticks, because the mega-exhibition is not going to go away.
1985 National Times (Austral.) 22 Nov. 31/2 Streeton's own importance as the leading painter..is itself up for re-assessment in the mega-exhibition.
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