[jenidallas]

Two options to consider:

1) There are several iPhone apps that will read QR codes. You'd likely need to cobble together the database on the backend but that would let you put together a low cost solution. (We use it for delegate voting for YMCA Youth & Government with multiple locations so I know that part can be managed.)

2) For a convention, the hotel should have a contracted trade show/exhibit services company (Freeman is one of the biggies) who you'll already be coordinating other items through. These companies have scanner software and multiple guns that can be leased. I attend several conferences that use them either to read badges for admission or to track visitors to individual vendor booths. This will likely be a more expensive option but will come with the backend already built out.