Crossword Genius

They happen to involve equestrianism (6)

Ross

I believe the answer is:

events

I'm a little stuck... Click here to teach me more about this clue!

'they happen' is the definition.
(I've seen this before)

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for events that I've seen before include "Important happenings or incidents" , "matters" , "Incidents, occurrences" , "Occurences, happenings" , "Things that happen" .)

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