Hi BigTom. I'm sorry to hear about this. The event will be live streamed.

An alternative is spinning up an Amazon (or other) Ami with Windows and install AltspaceVR on that and run it of RDP remote desktop.

Here is a list of Linux clients:
https://kamarada.github.io/en/2020/04/20/remote-desktop-connection-to-windows-from-linux-using-rdp-clients/

That said.... AltspaceVR itself is nowadays partly owned by MS :P. I hope you can make it. Coming weeks i'll share a possible setup walkthrough on the HiveFest support pages @ https://hivefest.freshdesk.com