Duquesne Family Office's billionaire boss bid adieu to Wall Street's hottest AI stocks in favor of another trillion-dollar company and a long-awaited turnaround story in the healthcare sector.For a lot of investors, earnings season is the highlight of every quarter. It's the roughly six-week period where most S&P 500 components report their operating results and give investors an inside look at how "healthy" corporate America really is.But earnings season is far from the only important event each quarter fo ...