You would not be turned away. You might feel slightly underdressed if very casual, but it wouldn't be unacceptable.
We went after work and my friend is in construction, we were welcomed in the dinning hall
There is a bar area/tavern which is more casual than the dining rooms. There you might see someone casually dressed. The dining area tends to be people ranging from more business casual to dressed up for a nice night out .
We did business casual, but folks are dressed at all levels
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