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A gig by rock band The Black Keys was then postponed, followed by a concert by US rapper A Boogie Wit Da Hoodie, which was called off when part of the ventilation system fell to the floor shortly before doors were due to open.
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Unions argue that "one day less" can be good for energy, productivity and society, and that normalising four‑day patterns can keep people in work who might otherwise drop out altogether.
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