After a weekend of high temps near or in the 70's, a cold front blew through the night going into the first and continued to be cold for the second. One possibility of what got animals moving.
Second possibility was that the hunter pressure let up. I read earlier this year that thanksgiving weekend is the busiest hunting time outside of opening weekend in Texas, so the animals could have had less pressure and coupled with the cooler temps decided it was time to come eat.
All I know is I sat for the weekend prior to the first and saw jack, so glad some people sat the next day and saw some stuff.