Parade registration site requires you to post your postal code. HOWEVER, it only accepts the USA style — 5 digits. Use the three numbers in your postal code and add 111 to the end. Ours is L5B 2G2. I used 522111 and the program accepted it.
I did a correction on the credit card billing address page.
I use the same technique when paying for gas at US pumps that require your Zip Code. Use the three numbers in my Canadian Postal Code followed by 111 and you’ll avoid having to go to pay the cashier inside.