Funny enough, but we do spend a great deal of time tracking down payments and when we used to post the actual due date in School Soft, it would lock out the deposit on the next day with no grace period. SO...... to counteract this, we made the due dates in the program for April 21.... obviously that would be long after the event is over. Its just our way of allowing a bit of wiggle room for those who might need it. That said, you are also welcome to make both payments now if it works better for you.
As always, if you have any questions, please do not hesitate to call.