We did the show first & dinner after. I prefer not to be stuck sitting still in a seat right after a meal, which is why I did it that way (also our norm elsewhere for evenings involving a meal & a show or movie).
In hindsight, I was really glad that we did it that way because it gave us a lot of time to reflect on & discuss the show. If you haven't seen it before, it's worth savoring the memory of it over a good meal afterward.
Enjoy!