Somehow the last day of races (meant as a leftover set of races for when there are 105 Wednesdays/Saturdays in a year) got updated to be Feb 11, 2019. I’ve updated the date, deleted all the entered horses (for the incorrect Feb 11 only), refunded entry/shipping costs, and reset the horse locations.
Bear in mind that 2yos shouldn’t run until April, so if you see a 2yo race in February it’s probably a sign that the race schedule is messed up. 
Also, 100 races per day is a bit more than usual.
For now I’m going to disable the script that changes race days until I can figure out how this happened.