The usual start time for pre-sales is Thursday mornings at 10 am. Last night I downloaded the ticketmaster app to my phone and bought tickets to Major Lazer with no issues at all during my break.
It's a Friday night in Oakland and the presale password is murmur if you're interested!
The last time we saw them at some chi-chi-ish (shi shi?) place in San Francisco and it was reeeeeally fun. One of the dudes who used to be in Major Lazer quit out of the group because he found the Lord and now makes awful music with a message. When he was part of Major Lazer he had a move called daggering where he would jump from a ladder with his pants pulled down onto a girl who was lying on stage. Classy.