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The distinction doesn't mean anything though. In both cases it is up to the FCC to regulate usage, not you, or a hotel, or a conference organizer.

It's not their spectrum to manage, and everyone else has just as much right to use it as they do, event or no event.

Deliberate interference of the legal use of the airwaves by others is flat out illegal.

I was talking about the WiFi bandwidth not your 3G/4G bandwidth

Spectrum is spectrum. Convention centers don't own WiFi spectrum any more than they own cell phone spectrum.

Well, that's the downside of using an unlicensed band. Nothing says you can't get a license for a restricted band and set up shop there, then the FCC will help you shut down interlopers instead of smacking you down when you try to do it yourself. Of course, getting the appropriate equipment will be highly troublesome, but so it goes when you want to control what people transmit.