Business Professional for Conference

Hi!

I am attending an industry training/conference next week where the expected attire is “business professional.” What does that mean? I am a firefighter so I am accustomed to being in uniform most of the time. I have a decent wardrobe for personal wear across various settings at home.

A Google search yielded a wide variety of information so I thought I’d seek opinions here. I’m located in California, if that is relevant. Thanks!