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i think with card shows it can sometimes be hard to set a plan. other then going with just a set amount of cash and not going over budget. Or if your looking for certain things specifically then you focus on that and then go back to the other things that are outside of what you went for.
If its first time or first few shows i would say go with no plan and just walk the place and get a feel for things. Its what ive been told to do by others.