Corbin Ball is an authority on meetings technology. He mentions, among other things, a couple of interesting scenarios for beacons (and NFC) within meetings/conferences.
Ten Transformative Meetings Technology Trends for 2015
CliqTags and Beacon Reader can be used for most scenarios mentioned, without any need for custom development.
Also, NFC, QR Codes, SMS and e-mail could be utilized as alternatives/complements, before, during and after the conference. CliqTags supports them all, out of the box.
Abiro’s collaboration with MM3 provides in-meeting features like real-time voting and Q&A, creating a seamless conference solution called CloudConf.