If the nip in the evening air didn’t hint that we’re getting close to Halloween, this week’s calendar surely will: There are pumpkin patches, pumpkin-carving contests, pet costume parades and a family pumpkin festival with pumpkin painting and spooky stories. There are outdoor screenings of “Halloween Town” and “Hotel Transylvania.” Don’t miss the harvest festivals, either, as more than 40 Loudoun County farms open their doors to visitors with food, drinks and cuddly animals, and Georgetown merchants host a seasonal sidewalk sale. Elsewhere, kids can get their fill of construction tools and construction equipment — including a crane to climb in — at the National Building Museum’s Big Build; the European Union brings Europe to D.C. with a festival just for kids; the American Indian Festival

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