Once upon a time on a Friday night long ago, a tall, skinny, beardless man showed up at Jessica's doorstep to take her out on their first date. He stood there with a pie in hand because it was Pi Day and she knew there was something special about this guy. Four days later he asked her to be his girlfriend and she happily agreed.
While visiting Trevor on the Appalachian Trail for his birthday, Trevor surprised Jessica by proposing with a ring pop. (It’s all he had access to on the trail) She promptly accepted and then asked if he finally decided to propose because she had just purchased a sleep number bed.
Their anniversary date being Pi (3.14) has always played a role in their relationship and they wanted to incorporate their wedding date into that. They chose September 15th because it continues Pi. (3.14159) Just as their vows will represent their commitment to each other, Pi is the symbol used in mathematics to represent a constant that continues indefinitely.