Gold futures for August delivery reversed early losses on July 26 after the Federal Reserve kept interest rates unchanged and said it would begin shrinking its balance sheet relatively soon. Speculative short positions had reached their highest level since December 2015, and the dollar weakened after the statement.
A weaker dollar makes dollar-denominated metals cheaper for foreign buyers and tends to lift commodity prices broadly. Gold itself is not a feed input, so the direct effect for feed buyers is through the dollar.
After 1,637 past bearish macro events, US Dollar (Broad) moved a median -0.2% over 5 sessions (39% higher; middle half -0.6% to +0.3%), and -0.2% over 20.
Moves of each commodity's benchmark from the last close before the event. Historical reads pool past events of the same kind; they describe what happened, not what will. Not investment advice.