This is not a prediction and this is not the analysis. It is just S&P 500 intraday charts over the past 14 years in the Christmas season from www.marketvolume.com
I guess I may add 2015 Christmas chart to the charts above. Now, we have 10 times out of 15 he market (S&P 500) reversed its trend shortly after the Christmas / New Year holiday season: According to this statistic, Next Christmas season there are 67% probability you will see a reversal shortly after 2016 Christmas.