Did someone mention extra rotary blades?
Also, you might want to consider doing something outside your regular comfort zone once you get there. It maybe a new technigue that looks very 'doable'. So consider things like applique pressing cloths (actually, I usually use parchment paper), paper cutting scizzors, old rotary blades marked 'paper', basting glue, etc. Think of things you bought in the past but haven't gotten around to using for whatever reason.