Hobby Swap: Pesky details

Okay (she said nervously), maybe I can host this.

Timing: It didn't take much calendar-glancing to push this thing into early December at the earliest. If people are too busy at that time of year we could have it in mid-January. Opinions?

Who gets what: Any ideas on who should decide, or how the decision should be made, on who goes home with what? Suppose I did really bring my cake decorating kit, in which several people expressed interest. Who gets it? First-come-first-served, or whoever pays a monetary asking price as at some swap meets, or whoever's "really" going to do something with it, or whoever has something the original owner wants in trade, or whoever's hands are emptiest? Speaking of that last, suppose I (or anyone) brought only one item, and maybe nobody even wanted it; would it cause hard feelings if I then go home with stuff for four new hobbies?

Comments and flamewars here, and if there's no clear resolution I'll make a poll. :-)