Submitting an application is how to be considered for an official showcase performance slot at the SXSW Music Festival.
A registration is the badge purchased by individuals to attend SXSW.
Band members do not need to purchase a registration to apply for a showcase. Domestic US artists who are offered a showcase can choose either SXSW Artist Wristbands or a cash payment for their showcase. All international acts receive SXSW Artist Wristbands. All applying artists, whether accepted to showcase or not, will be able to purchase registration badges at the lowest registration rate after notification of status, if they choose to do so. There are no refunds (and no exceptions) if you purchase a registration at a higher rate or decide not to attend if you are not offered a showcase.