Jack Daniels (the world-famous running coach, not the Tennessee whiskey) recommends three quality days per week, and stacking two of them consecutively on a race week.
http://bit.ly/dsCTee

Now, he doesn't specifically recommend a hard workout the day after a race. But I think after a cross race, especially 30 minutes, it's not a bad idea. People double up weekends with two races all the time, of course.

Daniels also says at least two easy days before a race, and I agree with that too. So the other pattern is to stack quality days on Tue/Wed or on Wed/Thu.