When the sun broke through the dreary sky on a recent summer’s day in London, Lauren Thompson started packing for a family picnic. Another city resident, Maxwell St Hill, began masterminding plans for an afternoon barbecue. And Johana Bowhill texted her friends that a day dedicated to outdoor games — to celebrate her 24th birthday — was going ahead. Though strangers, the three Londoners all had the same idea for the best way to take advantage of the precious blue skies. “The first thing that people do is flock to the parks,” Ms. Thompson said.

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Persons: Lauren Thompson, Maxwell St Hill, —, Ms, Thompson, “ There’s, ” Locations: London