It's rather suspicious that LXJS tickets are being offered on ti.to, not on LXJS's own domain, lxjs.org. And LXJS's own site claims that early bird tickets are sold out:
Also, note that the 2014 conference is in Lisbon, Portugal.
Also, note that the 2014 conference is in Lisbon, Portugal.
Never the less, your question is very pertinent! thank you!