What is the seating arrangement? Are they all chairs at a table?

There are booths along the back wall also

I am attending the graduation tonight and if I get there at 6:30 will I be able to grab a good seat? I didn't buy the fancy tickets can I still get something to eat or drink?

The majority of the seating consists of small round tables with chairs in close proximity to one another. There are some booths in the back but that is limited. There is VIP seating to the left of the stage.