Notdeadyet no I'm afraid you can't jump on and off low carbing - it's completely different from calorie counting!
Basically what low carbing does is keep your blood sugar levels stable, so you're regulating the amount of insulin you are producing - which in turn will regulate how much fat your body ends up laying down (very simplistic explanation!).
Every time you increase your carbs, you effectively increase insulin production therefore raising the likelihood of laying down fat.
You don't create a carb deficit in the same way you can with calories.
However, I know that there are other low carb plans that advocate a carb feast day, and StuntNun knows more about this than I do.
But if you're joining us on Bootcamp, please follow Bootcamp rules, which means no rice (not even a small amount) and definitely no chocolate tart!