We did Thanksgiving at Biergarten during the holiday surcharge but we did it for a late lunch. If you get a seating for the very last lunch seating, you will be there right before the a performance of the band. Then, you can extend your meal until they bring out the dinner food (which doesn't have very much additions) until after the performance. So you can partake in both lunch and dinner but for the lower lunch price. That's what we did without really knowing it.