After working with over 100,000 weddings, we have seen every seating chart scenario imaginable. Here are the tips that make the biggest difference.
Build in buffer seats. Spread two to three empty chairs across different tables rather than leaving one table half empty. This gives you flexibility for surprise plus-ones, last minute RSVPs, or vendor guests (your photographer or DJ coordinator may need a seat for dinner too).
Assign a seating chart point person. On the day of, give a printed copy of the final chart to your day-of coordinator, venue manager, and one trusted bridesmaid. If a guest has a question about where they sit, there should always be someone nearby with the answer so it never falls on you.
Think about the flow of the room. Place tables with young guests and your most social friends near the dance floor. Put older relatives and guests who may leave early closer to the entrance. Keep the couple's table in a central spot with a clear path to the bar, restrooms, and dance floor so you are never trapped behind three tables when someone requests a photo.