Big naughty no-no signs out front. From what I've heard on the forum this is likely the scenario: The convention bureau is a public/private partnership (whatever that means). You can't CC (and the signs say no weapons period), but under the law, you can OC. What was suggested to me will happen is they will pull the "private" card and ask you to leave.
Might as well try it. Make sure you can 'educate' the folks (see my link below, he he he) when they most certainly challenge you. I don't know if it's worth potentially being asked to leave with your family there. Maybe call it an exercise in family rights outing.