Revelers streamed into the Brooklyn Mirage on a recent weekend to the steady pulse of electronic music. Diplo, the Grammy-winning D.J. playing that night, was not the only thing on their minds.

Fans had made their way past waste facilities, lumber yards and tire shops in this corner of East Williamsburg, across a train track and pockmarked streets, chipped away by trucks. Cellphone service is spotty. Streetlights are scattered. Public transit is a 15-minute walk away.

There was a renewed sense of caution after three men who left venues in the area were found dead over the past year.

“We never come alone, and we never leave alone,” said one frequent patron at the Brooklyn Mirage, who would give his name only as Felipe G., 30. “This is an industrial zone. You just don’t know who is here.” He said it was a place to “be smart about your partying.”

The deaths of the three men, whose bodies were found in a creek near the venues, have chilled the nightlife scene in one of the city’s most popular neighborhoods for D.J. events and dancing.