Key openings in equestrianism (6)

I believe the answer is:

events

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'equestrianism' is the definition.
Although both the answer and definition are nouns, they are not in the same form of the noun.

'key openings' is the wordplay.
'key' becomes 'e' (musical key).
'openings' becomes 'vents' (vent is a kind of opening).
'e'+'vents'='EVENTS'

'in' is the link.

Can you help me to learn more?

(Other definitions for events that I've seen before include "Occurrences, happenings" , "races?" , "Incidents, occasions" , "They happen at a given place and time" , "results" .)

I've seen this clue in the Evening Standard.

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