79.Trooping the Color It is an official celebration for the Queen's Birthday on the second Saturday in June around Buckingham Palace in London.This ceremony of the Queen inspecting her troops derives from old military traditions in which regimental flags were paraded before the monarch.Early in Victoria's reign,it was decided that this ceremony should be held on the sovereign's birthday.79. Trooping the Color ◆ It is an official celebration for the Queen's Birthday on the second Saturday in June around Buckingham Palace in London. This ceremony of the Queen inspecting her troops derives from old military traditions in which regimental flags were paraded before the monarch. Early in Victoria's reign, it was decided that this ceremony should be held on the sovereign's birthday