I don't think it's ever sold out before mid-March in the past. Mumford, Macklemore and the Postal Service are going to get a lot of people to buy early, but tickets are still like $337 which is a lot for college kids. March 30, PM.
With the way they are mailing wristbands, my guess is there will not be a lot of scalping. Yes, some of the scalping sites have tickets, but with just 300 on "S**b-H*b" this is about 1%. Granted 1% is too many, but it is nominal in the larger scheme of things.
Hopefully they will release another batch of 500 or 1000 in a few weeks. 500 tickets every few weeks will keep the scalpers at bay.