AI will be making a volcano cake with dry ice, I will be using the mini wonder pan mold for the volcano. As most decorators like to take pictures before the cake leave the building, once the dry ice is activated (smoke take affect) could a picture be taken at the facility and then the customer could activate it again at the party venue?
Aif there's enough dry ice left or if you get two pieces
AMost likely you'll have to add fresh dry ice at the venue. This is just frozen (solid) carbon dioxide, and the "smoke" you are talking about is the carbon dioxide turning straight into a gas, bypassing the liquid phase. As soon as all of the dry ice has turned to gas (this is called sublimation), the effect will end. You then need to add more dry ice for the effect to continue. Depending on the size of your dry ice, you might get up to 20 minutes out of a single piece.
You can make it more dramatic and cut some chips of dry ice and pour hot water on them for a faster transformation.