You can find detailed information regarding accessibility on the SXSW Accessibility page.
During the event, accessibility help desks are available at the following locations:
ACC Trinity Street — Austin Convention Center, across from Exhibit Hall 3/4 near the Trinity St. Entrance, open 9:00am - 6:00pm March 3 - 13
ACC Registration — Austin Convention Center, Exhibit Hall 1, open during the location's registration hours
Marriott Downtown — Moontower Hall, open during the location's registration hours