>>303789326
>>303790259
Late to this reply chain, but if the focus is audio only, why not go for Icecast? You can host it on a cheap VPS, or ask around for someone that has a VPS and see if they would be willing to host it. A 100mbps VPS can have roughly 300 listeners if you stream 320kbps MP3 audio. I know it can be done as an event hosted from the Anime VRChat dicksword in February 2018 utilized Icecast for music.

I haven't played VRC since, as I don't have VR, so I haven't seen what you have done for previous events, but it's just my two cents. Icecast can technically do video as well but at that point though you could just do an nginx-rtmp setup as was already mentioned, since it would probably be easier to figure out for OBS setup.