The first thing you did when you arrived was buy your meal ticket, which was assigned a letter for the sitting you were assigned.
My father gave me some of his old suit coats a few years back. In the pocket we found some of the meal tickets. When he started his fade, he kept the jackets for occasions that required formal dress. But, for the most part, he hung them up and forgot about them. It was an interesting find.
Our curcuit assembly hall had an iced cream shop, and anyone could just go ask for a soft serve cone, no charge. Lunches were good times.