Concealed being the keyword. If they don’t see ti they cannot ask you to leave. Here in Texas just a sign won’t do. It has to be a size prescibed by hte law and has to have a certain instruction in a specified font size or it is meaningless.
I carry mine everywhere. In church, to my kids’ school, in all restaurants, etc... The only place I don’t is where I have to pass through a metal detector.