Being in the food service business, it is very typical for servers to stage
stationary stations throughout a venue of this size, for ease of service.
If you notice they have one of each item being served
so they can easily accommodate the masses. It's usually one
server for every ten guest. That is my take from the photo.

P.S. By the way the bottles of wine and beer has not been opened.
Which is a display for the patrons to know what they are serving.

Bon Appetite!

JAX