I'm not a big fan of calorie "banking" per se. IMHO it is better to accept rare increases in consumption of calories and carbs on "special occasions" and the just get right back on your program.

On those "special occasions" make plans that will allow you to enjoy the festivities without going completely off the rails nutritionally. Take a traditional Thanksgiving dinner for example. Plan on eating larger portions of turkey, green beans, and whatever other relatively healthful selections are available and go very easy on the stuffing, sweet potatoes and pumpkin pie. Try to keep your portion sizes reasonable.

Say you eat 500 kCal and 40g more carbs than you would at a typical meal. Not a disaster. Don't starve yourself before (it'll just make it harder to resist overindulging) or after (that'll just exacerbate the blood glucose crash). Go back to your normal nutrition and exercise plan, maybe go back to induction for a few days, but don't cut calories below your normal daily average. Any momentary gains will be forgotten in a couple of days and life will be good again.