Atkins is a way of life. In order to be successful long term you need to get your head around the idea that this is how you eat from now on. No free days, no cheats. This is your life.
Will there be times you lapse? Of course. But planning it that way is not usually conducive to success. I have gone off plan by design and gotten back on after but it wasn't easy and I don't advise it on any regular basis. It would have been far easier to stay on track. Sorry to disappoint but better to know this up front.