August 12th is celebrated as International Youth Day. It's a day to recognize the importance of young people and their contributions to society. While it's not specifically related to any of the individuals you mentioned, it's a day that could be fitting for them to celebrate in their own way. Donald Trump, Kim Kardashian, and Bill Gates could use the day to highlight the work they've done to support youth initiatives or to encourage young people to get involved in causes they care about.