When Carley Roney and David Liu got married, they had a seat-of-the-pants celebration on a sweltering Washington rooftop. They never planned to go into the wedding business, but soon saw an opportunity in the market for a fresh approach to wedding planning. In 1996, they founded The Knot, a website with an irreverent attitude about "the big day." The Knot weathered the dot.com bust, a stock market meltdown, and eventually grew into the lifestyle brand XO Group, valued at $500 million. PLUS for our postscript "How You Built That," how Michael Dixon's business, Mobile Vinyl Recorders, uses portable record lathes to cut vinyl at parties, weddings, and music festivals. Learn more about your ad choices. Visit podcastchoices.com/adchoices