Lyn Gardner: “Just as the window displays of Topshop may deliberately scream that their wares are not for me – a middle-aged woman – many venues unwittingly send out the signal that theatre is not for everyone. … If the public has paid for these buildings then they truly must be places available to the public – and artists – all day long, to do what they want, not what they are directed to do. They shouldn’t feel the need to be invited in, but they should be made to feel welcome whatever their purpose for being there.