>We find that low-wind-power events are less frequent in winter than in summer, but the maximum duration is distributed more evenly between months. While short events are frequent, very long events are much rarer. Every year, a period of around five consecutive days with an average wind capacity factor below 10% occurs, and every ten years a respective period of nearly eight days. These durations decrease if only winter months are considered. The longest event in the data lasts nearly ten days.

https://iopscience.iop.org/article/10.1088/1748-9326/ab91e9

In your once in a lifetime event I'd be happy if we used a bit of gas. This is something, after all, that Japan also had to do for years after Fukushima went kaput.

Bear in mind also that demand for heating and transportation can be timeshifted. An Octopus tariff in the UK already allows for this. We've barely scratched the surface of whats possible here because electric grids are slow to evolve to this new reality.