https://www.investopedia.com/terms/a/announcment-effect.asp
An announcement from the Federal Reserve (“the Fed”) about a change in interest rates generally correlates directly to stock prices and trading activity. For example, if the Fed raises interest rates, then stock prices are liable to fall.
In general, traders eagerly await announcements that come from the Federal Reserve. On Fed days, trading volume is notably higher; and on the day preceding a Fed day, trading is usually relatively calm.
This is pretty much common knowledge for anyone with a passing interest in publicly traded securities.
This is also ignoring the actual business cycle consequences of monetary policy, too.