You and Jennie seem amazing so I'm not going to try for vague relationship advice, I hope your friends and family have that covered.
But for the wedding (and honestly big parties in general), plan the shit out of it until the night before, and then don't worry about it anymore. Starting then just enjoy the feelings. You're getting married! To a really cool person! It should be fun! Let the food people handle food and the music people handle the music and trust the groomsmen and bridesmaids to handle the little possible mishaps. Your job is to take in the the people you've gathered and celebrate this new fun part of your life.
(so that's my unsolicited marriage advice from an unmarried young person, bc Matt said I could)