I spent the day at 'Substack Coachella,' which was full of panels, partying, and old-school magazine vibes

Substack threw a party for writers and media founders in New York City. Sydney Bradley/Business Insider Substack hosted an all-day forum on the state of media. Then it threw a party. The newsletter platform invited its own writers, outside journalists, and media startup founders. Here's a glimpse into the night: an indoor pool, an after-after party, and an abandoned musical act. My day with Substack began at around 10 a.m. on Thursday, with the platform's CEO, Chris Best, telling a crowd of...