The British Geological Survey says there was an earthquake in North Wales last night.
It had a magnitude of 2.3 and struck at 10:41pm.
It was felt in Caernarfon, Anglesey, Porthmadog and Bangor...
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Prime Minister Theresa May announced the decision from Downing Street.
A fairly cloudy night to come with hill and coastal fog lingering in places. This could be thick enough for the odd spot of drizzle.
Father-of-three Nick Bickerstaff, from Denbighshire, was waiting for daughter Ellen and her friend in the foyer at the end of the concert.