Visit slum cafe when drunk - it features many bands (5,8)

I believe the answer is:

music festival

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'visit slum cafe when drunk it features many bands' is the definition.
I can't tell whether this defines the answer.

'visit slum cafe when drunk' is the wordplay.
'when drunk' indicates anagramming the letters (a drunken or disorderly form of the letters).
'visit'+'slum'+'cafe'='visitslumcafe'
'visitslumcafe' anagrammed gives 'MUSIC FESTIVAL'.

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I've seen this clue in The Irish Times.

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