The Buck stopped here

The Buck stopped here is a weekly blog by our contemporary art correspondent Louisa Buck covering the hottest events and must-see exhibitions in London and beyond

Halloween with Ai Weiwei: artist's new film screens in Piccadilly Circus and online tonight

The Chinese dissident artist is stopping the regular advertisements in the famous square for an hour

Four billboards outside Hull, England: art project commemorates sex workers who have died

Collective of former sex workers and the artist duo Henry/Bragg are behind the installation