Her arrest came on the back of the detentions of party treasurer Colin Beattie and former party chief executive Peter Murrell - also Ms Sturgeon s husband - who were both subsequently released without charge.
The National Eisteddfod has traditionally had a Welsh language-only policy for the annual event. The chair of its ruling board said the main purpose of the festival - which dates back to 1176 - was "to perform, compete and discuss in Welsh - and only in Welsh".
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