I already expect lower sales in the Spring and I still enjoy a chance to display my items and hear, "Oh you make such lovely things." Even if those kudos don't translate into dollars. It is my time to exhibit my designs and work.
Last year the items most requested were: boot cuffs and cowls. At my last craft fair (in the fall) I quickly sold-out of my entrelac cowls and had requests for boot cuffs so I got to work and made more but (of course) the spring craft fairs are just not as conducive to wooly knits.