I recently got in to the Evolve Alpha but am sadly unable to play it because I dont have my PC near me this weekend. I did however receive multiple codes to get into the alpha and I will share them here. It is an event happening this weekend only.
082C6-C7TW0-QVZZ6
082E6-2LRIE-EIIPQ
082HL-W2CRF-KYKKB
082II-0J098-ERJWM
07JJP-85TNY-48EFD
07JK0-XF5J7-A05F0
07JNW-R6WKX-9K4NL
07JQW-K290G-0IY0C
I think you could redeem them at evolvegame.com
Have Fun!