When is Halloween

Also today: The productive power of urban “activity centers,” and federal prosecutors charge the alleged “Wolf of Airbnb” with fraud.

Petersburg, Florida, will shut down nearly two miles of streets for trick-or-treaters, while San Francisco will host a block party as part of its “Spooky Streets” program. For a second year in a row, St. As children in costume get ready to crisscross streets in the dark, parents and city transportation officials are sounding the alarm about the most frightening part of Halloween: It’s the most dangerous night of the year for traffic fatalities, with the risk of pedestrian death increasing by an estimated 43% compared with other nights.