Fashion worth wearing in the event (6,5)

'the event' is the definition.
(hammer throw is a kind of event)

'fashion worth wearing in' is the wordplay.
'fashion' becomes 'hammer' (both can mean to construct or forge**).
'wearing' indicates anagramming the letters (wear can mean to become damaged).
'in' means one lot of letters goes inside another.
'worth' with letters rearranged gives 'throw'.
'hammer' going inside 'throw' is 'HAMMER THROW'.