What makes a great party? Brock Colyar is trying to figure it out. The 24-year-old party reporter joins New York’s club kids for an evening out, then breaks down what they saw and how they felt in “Are U Coming,” a newsletter for New York Magazine.

With curiosity and humor, Colyar captures the breadth and range of nightlife and the people who love it. Their profiles push the possibilities of partying to its outer limits, and they’ve tagged along with Blockchain bros, international pop stars and even nightlife legend Susanne Bartsch. But when we speak, they’re at home in Brooklyn enjoying something of a rarity in their line of work: It’s a Friday morning, and they’re getting ready for a weekend of rest.

Nathan Ma: What was the inspiration for “Are U Coming”?

Brock Coly...