Don't stop dating. love on multiple levels: sexually and romantically, as a family member and life partner, and unselfishly and God-like. Because after some time, the Romance may die down for a period of time, but the love on other levels pulls you through. And most importantly: communicate and make time to have conversations (not relating to kids). Best of luck with your marriage! I hope you two have many years of happiness.
Don't let someone's bad attitude ruin your day. My mom tried to make a scene and ruin the day for us and I let her. I regret it ): also, if you don't have a schedule for the day, I'd suggest making one. ☺️ congrats though!!!
For your wedding day: The day goes by so fast, so just try to enjoy every second of it! Also if something goes wrong, you will be the only one who knows what was supposed to happen, so don't stress.
For your marriage: Pick and choose your battles! Build up your partner, don't tear them down! While fighting, don't say things just to hurt each other and walk away from the fight for a little bit if it is getting too intense. Lastly, it may sound morbid, but enjoy every second together, you found the person you love, and they/you will not be around forever.