Great if you're willing to participate by helping us out! SHA2017, in the tradition of the four-yearly hackers festivals, is entirely run by volunteers who pay for their tickets like every other visitor. Some of us are working on organizing the event months, years in advance.
The angel system will be up soon. You can already register if you find it, but there are no shifts yet. :)
Meanwhile, join the IRC channel: irc.freenode.net/#sha2017-angel
If you want to help out before the event, check the Orga wiki and the vacancies on it! Welcome! :)