January 29, 2013. Among the many events worth your time at SXSW is the Accelerator competition. The 48 interactive finalists who will present on the Monday and Tuesday (March 11-12) of SXSW were announced today. Eight companies in each of 6 categories were selected, along with 3 alternates in each of those categories. On Wednesday the 8 music finalists will present, those also backed up by 3 alternates.