I should do that with my husband! I need some new tech.
I keep my phone in my purse...if I get a notification (email/text), I'll glance at it and act on it only if it's important. If it's a phone call, I'll only answer if it's my mom (who only calls if it's something important) or my husband. Every one else goes to voice mail.
But doesn't really help if it's on vibrate. And you'll probably still need to interact with the phone to at least turn of the ringer if its not somebody you want to answer, lest you annoy everyone around you by letting it continue to ring.
Interesting idea though. They know what sort of atmosphere they would like to have, and they're incentivizing people to make it happen.