I've drawn my weapon before, BG ran off, no shots fired, no cops called, put it away and went on with my vacation as if nothing happened, once the adrenalin subsided.
NEVER EVER carry a Glock in a floppy holster.
In Texas, it's illegal to carry in a post office, sporting event, place whose income 51% from sales of alcohol, amusement park, a business with the proper sign up, etc. You might just wanna stash the gun under the seat of your car. I ignore the deal, myself. If it's concealed, nobody will know. At events, though, I put it away. Some events will have metal detectors at the gate now days post 9-11.
And, no, never be holding a weapon when the cops arrive...
Anyway, for safe carry especially IWB, I consider a quality holster essential. I won't by those spring clipped floppy things, junk. Call me a holster snob, I guess, but a good rig like a Sparks Summer Special isn't, but about fifty bucks. I have one rig, a Rosen, that set me back $140, but I've used it a LOT. It's very comfy and ultra high quality. Pocket carry with other than a Glock, a true DA, you can get away with cheap. It just has to hide the print and keep the gun in place. But, IWB, I want quality. I think the best bang for the buck in IWBs is the Sparks Summer Special, of the ones I've tried. It's very high quality and affordable and is a comfortable way to carry a service sized gun securely.