I suppose it all depends on how long the slow season is and how slow is slow, perhaps also how good are the good times and the state of your finances.
We usually have about a month and a half each spring and fall that are pretty dead and another couple of months in the spring that I'd call slow. The good times, well hopefully we are busy at least on weekends.
The spring dead time and slow time is usually devoted to painting, fixing, getting the garden in shape for the season, maybe some vacation time and this year we offered a deal to our Facebook friends, as much to offer something extra to those friends that follow us during the year as for the revenue. The late fall/early winter dead time may depend on the weather, vacation, projects, chance to rest if we were hopefully busy with leaf lookers in October. We're old folks and old timers now at this, learned early that we best save when we were busy for the quiet times and for years one of us worked an outside job as well to help through the slow periods.