Performing unspecified athletics, regardless (2,3,5)

I believe the answer is:
in any event
'regardless' is the definition.
(I've seen this in another clue)
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for in any event that I've seen before include "Anyway" , "No matter what happens" , "Whatever happens" , "An all-rounder's chance is here" , "How one might describe a decathlete's skill" .)
