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I have tried a couple of different ways for different sized events.

It depends if you want an intercom or a ‘shout box’.
We use the shout box method fairly frequently now.

Mic goes into any input then at the other end, dial up an output as a direct out source for that mic. Plug into a powered speaker and adjust the volume on the speaker to taste.

This doesn’t use up any busses and also means you don’t need any faders or controls on the i-live surface.

You just use the mic to ‘shout’ at the other end to put their com sets on and then do the actual communication through a headset.