FYI ~ The Augusta Civic Center is city owned therefore it does not fall under state owned property restrictions regarding open or concealed carry like the state owned Augusta Armory.
Carry at your will.
I have been there each year and open and concealed carry when you shortly took your diapers off.
Never had an issue at the welcoming. I did have an issue at the inn next door with a naked woman banging on my door at 11:30 at night during the Maine Sportsman's Show...