Few things in life are more stressful for an event professional than when a client insists on making last minute changes. Last minute changes are not only stressful, but often expensive as well. In order to prevent this from occurring, event professionals should lay out expectations in detail in a signed contract with the client. Also, do not agree to anything that you might not be able to deliver on later. Furthermore, event professionals should not fall into the trap of the so-called sunk-cost fallacy, and should never feel obligated to meet unreasonable demands. These, along with other tips, will help event professionals deal with the stresses of a client who springs changes onto them at the last minute.