This year’s Whitney Biennial, considered the country’s most important showcase of contemporary art, has 75 participating artists — and one who has already withdrawn.

LONDON — A few weeks before her London Fashion Week show, scheduled for Sunday, the prizewinning fashion designer Grace Wales Bonner was wandering around a show of a different kind at the Serpentine Sackler Gallery here.

The 15 or 20 minutes before the performance ticked by the same way they do on nights when Rome Neal presides over jazz at the Nuyorican Poets Cafe on the Lower East Side of Manhattan. But this time Mr. Neal was directing a reading of a play. It takes aim at the sensation that is the theatrical juggernaut “Hamilton” and its creator, Lin-Manuel Miranda.

The millions of dots on the map trace highways, side streets and bike trails — each one following the path of an anonymous cellphone user.