The original Black Hat event was an add-on to the Defcon conference. Black Hat has evolved into something very different than how it started. As Black Hat started attracting more sponsors, the number of vendor-sponsored parties started to grow. The parties became bigger attractions than the event itself. The top headlines however come from the sessions that are cancelled. Cancelling a session makes more news than the story itself. However, Black Hat still strives to release Zero Day vulnerabilities. It is clearly a business decision to attract revenue from those people who are skipping the conference and attending.”]
Source: https://www.csoonline.com/article/2597936/the-black-hat-evolution.html