DEN-LAX on Tuesday (11/25) at 5:30 p.m.
LAX-DEN on Friday (11/28) at 4:00 p.m.
I noticed that there are 777 flights both SFO-DEN (two flights, actually) and LAX-DEN (plus a 787 on 11/30) on Saturday and Sunday (11/29 and 11/30), so maybe those are going to be the busiest days.
More worried about finding a parking spot in Denver on Tuesday than the flights themselves.