Nothing feels quite like fall in the art world more than venturing into the bright white tents of Frieze London and Frieze Masters nestled among the changing foliage of Regent’s Park. Every October, the art fairs bring with them a citywide feast of exhibitions, satellite fairs, and happenings around town. It may be the best time to experience London’s robust gallery scene—from big names in Mayfair to rising talents at the city’s younger galleries—not to mention its world-class museums.