Looking at historical performance on the 19th though, there's not anything extra-ordinary to worry about. It's just a day like any other, albeit one that does average slightly negative returns. On average, the Dow has been down 0.5% on all October 19th's since 1900. If you exclude 1987 that figure is -0.2%. However, of the 80 October 19th's on which the Dow has been open, the index has been positive on 39 of the days or about 50% of the time.