Boulders. Love. Flowers. This long anticipated 10th edition of Frieze Sculpture runs alongside Frieze London and Frieze Masters, but viewers won’t need a ticket. The exhibition is curated by Clare Lilley, the director of the Yorkshire Sculpture Park, and its artists include Ugo Rondinone, Robert Indiana, Alicja Kwade, Ro Robertson, and Jordy Kerwick. Their site-specific works, located throughout Regent’s Park, are free to all. —Elena Clavarino