Depends what you mean and how "free" you get!
Rest day from exercise? This is GOOD and actually necessary to let your muscles repair and be ready for the next time.
Eating whatever you want in whatever quantities you want? Depends on how "free" you get and what your day to day deficit looks like. Eating a couple hundred calories over your range probably isn't a huge deal. Eating thousands over can undo a weeks worth of work and for some people can set them up for the "I already messed up, why bother" mentality.
For example right now I'm only running a 200-300 calorie deficit daily. If on both weekend days I eat 600 extra calories (or if I include Friday, only 400 extra per day), my entire deficit is wiped out.
I think a day with an extra treat is good within reason, but it should still be tracked and shouldn't be a "free-for-all" day.
Do something everyday that your future self will thank you for.
| current weight: 179.8