Ai Weiwei, Julian Assange and graffiti grannies – the week in art

Ai Weiwei and the Celts conquer London. Plus extraordinary outsider artists, endangered buildings and the real Alice in Wonderland – in your weekly dispatch

Celts
The misty world of druids, King Arthur and the Book of Kells is brought to life in an epic survey of ancient Britain and our ideas about it.
• At the British Museum, London, from 24 September until 31 January.

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