It's over recent Census results, which showed a decline in the number of Welsh speakers.
The Welsh Government say the building remains open to staff and visitors as usual.
Cymdeithas are holding a peaceful protest at one of the entrances at the Welsh Government offices in Cardiff. The main reception remains open as usual to all staff and visitors.
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Some of the singers lost children in the Aberfan disaster. They perform as a way of coping with their grief and to raise money for charity.
Traffic on the M4 from Coryton to Cardiff is at a standstill following a multiple vehicle crash.
The ex-footballer, who lives in Flintshire, said he thought he was clever sheltering his car from the snow.