According to the search results, there is a UFC event tonight, but it is not clear which one it is. The most recent event listed in the search results is "Dana Whites Contender Series: Season 7, Week 9" which took place on October 3, 2023. However, it is possible that there is another UFC event happening tonight that is not listed in the search results. It is recommended to check the official UFC website or social media pages for the most up-to-date information on upcoming events.