Vintage Season/In Another Country

Vintage Season; novelette by Henry Kuttner and C. L. Moore (Sep 1946):

It’s the most beautiful Spring the great metropolis has seen in modern memory. the sun-drenched air seems full of hope, of promise for a better tomorrow. But across the river, in the suburb on the ridge that overlooks the city, Oliver Wilson is perplexed. Who are those elegant, perfectly-poised, almost exotic people to whom he’s rented his house? What impending event has drawn them here, to this sleepy suburb, as if it were the best seat in the house for the greatest show on Earth?

In Another Country by Robert Silverberg:

For time-traveling tourists, the rule about affairs with the locals is clear–look but don’t touch. To flout that rule is to invite endless paradoxes and complications–as the well-meaning Thimiroi finds out to his dismay, in this all-new tale by SF master Robert Silverberg, written especially for the Tor Doubles as a companion to C.L. Moore’s famous original.