- add an IR LED to each band and make it transmit a unique 2 byte MAC address on the IR channel(s) I would think it would be easier to just put a serial number

- add an IR LED to each band and make it transmit a unique 2 byte MAC address on the IR channel(s) I would think it would be easier to just put a serial number bar code on the back lining up to a MAC of sorts and scan it when the person arrives correlating the the serial number to their seat. That should give you all the location information you need, at least for the non-standing room only areas of the stadium.