We have used QR Codes on multiple occasions for a variety of purposes: to ease the download of our native mobile apps, to ease access to our mobile web apps, to use as short cuts to content within our apps, for scavenger hunts, etc. In most cases we encourage events and venues to print large QR codes on posters to attract attention and be scan to read from a distance. It was important to keep in mind that the more data embedded in a QR code, the higher density the module must be, making the scanning increasingly difficult. In the end it all comes down to whether the camera can actually see the smallest bit in the QR image, or the individual modules. It is necessary to keep in mind that the smaller the QR code, the smaller each individual element, and the closer the camera will need to be to ensure a proper scan.
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