Conferences are valued by their ability to capture the energy of a focused audience. OSCON lost most of its value as open source 'won': the featured technologies were too diverse and the rallying cry of 'open source!' was mostly met with "duh! of course".
I'm curious to understand the focus of this one: folks who love github? Cutting edge technology, as blessed by github?
Atlassian might want to pay attention to this, but I think 37 signals is safe from any real competition.