You could always just come down to Sydney for a few days, especially now that you're doing remote work.
For the hack night I was mostly thinking of fundamental Erlang things like pattern matching, message passing and threads, nothing too heavy into OTP or a specific library, unless people really want to do that. What were your ideas OJ?
There was some interest in doing web applications with Erlang using Cowboy or ChicagoBoss, that might be another option. Or setting up an OTP application from scratch, maybe picking out an example from the Learn You Some Erlang book and build it with rebar.
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Tim McGilchrist