I tend to believe there are so many variables that go into how a show will perform, that any factor you try and use is probably just a grasp in thin air. Some of the variables you'll want to consider: Is the crafting portion of the event the focus of the event? or is it ancillary to another event (concert, carnival, fair, etc) How long has this venue been in existence, and how well is it advertised? Is this event seasonally driven (ie: holiday, mother's day, etc)? What is the weather forecast? is the venue indoors or outdoors? Are there other competing events occuring the same day/weekend? There are certainly more considerations, but you get my drift. In the end, I always recommend that you make as much product as you can afford to/have time to. The bottom line? you can't sell it if you don't have it. That said, if you have a slow show, here's a way to recover: Schedule an open house or an online party to move your leftover goods. Target your next potential sales period (like after Dec 24th, we would be targeting Valentine's Day). If you had product specific to Christmas, you can often just re-name fragrances and run with them.