If the promo code that you are using is not offering the discount that you expected, there are a few things you should consider:
First, promo codes may not have an effect on the processing fees associated with EventSprout.com. Second, you may only enter one promotional code per transaction. If you have multiple codes that you'd like to take advantage of, then you must complete multiple transactions.
To apply promotions to your registration total, you will enter the case-sensitive code into the field titled, "Enter Promo Code" located above the field in which you enter your credit card information (this is located in the final step of the registration process).