Your Dress:

Proposal:

You, James, Remus, Sirius And Peter were on a walk and they let you two walk in front which confused you, I mean they were recording you with a camera for Merlin's sake! James suddenly stopped, holding your hand and he went down on one knee. You turned to Sirius, who was holding the camera with a shocked expression. Of course you said yes!

Your ring:

Venue:

You got married in the Forbidden Forest, just for the fun of it!

Wedding Invitations:

You guys used coins to contact friends and family about the details, like The Golden Trio did with Dumbledore's Army.

Wedding Cake:

You had donuts instead!!!

Honeymoon Destination:
You didn't have a honeymoon, your wedding was on the down-low so the Deatheater's and Voldemort wouldn't attack so you didn't want to take the risk.