I take my spinning wheel with me to these events because 1) it makes me pleasant and cheerful which is desirable when dealing with the public, 2) it's show bizzy and tends to draw people to come over and talk to me and 3) it's productive, leaving me with 2-4 hanks of hand spun yarn at the end of the weekend which pleases me.
I appear here to be staring dreamily at my own feet, but the photo above proves that I am actually spinning.