Submit a Payment Your Invoice/Event Number will begin with an ‘E’ and be followed by 5 numbers (e.g. E12345). It is printed in the upper right corner of your invoice. Quantity INVOICE/EVENT NUMBER Price 1 Please make sure your Invoice/Event Number (e.g. E12345) and the amount you’d like to pay is entered correctly before moving on. Once you are satisfied, click the ‘Continue’ button below to go to the next page where you will enter your credit card information. All form fields on the next page are required.