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You could conceivably self-host https://github.com/jeremyckahn/chitchatter (a web-based chat app I made that supports audio calls) and configure it to use a locally-hosted WebTorrent server to connect peers.
Do check out the mediasoup demo as an example (https://github.com/versatica/mediasoup-demo). There is an online demo here as well (https://v3demo.mediasoup.org/)
I think Mumble might fit what you're looking for. It's been a very long time since I've used it, but it seems to still exist: https://www.mumble.info/ - I've used previously for exactly what you're describing, events with lots of crew dispersed around and no budget for radios. I had it installed on an AP running OpenWRT so it was just a case of plugging that in and getting people to install the app and connect to it.
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