Oscar and Roger (not Romeo in the end) covering New York's peak creative event (7)
I believe the answer is:
orogeny
'peak creative event' is the definition.
The definition suggests a singular noun which matches the answer.
'oscar and roger not romeo in the end covering new york's' is the wordplay.
'oscar' becomes 'O' (phonetic alphabet: alpha, bravo, charlie etc.).
'and' says to put letters next to each other.
'roger' becomes 'r' (abbreviation used in radio communications).
'not' becomes 'o' (I've seen this in other clues).
'romeo in the end covering new york' becomes 'geny' (I can't justify this - if you can you should believe this answer much more).
'o'+'r'+'o'+'geny'='OROGENY'
Can you help me to learn more?
(Another definition for orogeny that I've seen is " origin of mountains".)