There are a lot of hotels close to the event site. The event takes place at Auditorium Shores at Lady Bird Lake in Austin, TX. Below are a few suggestions, screen shots of maps and links to active maps where you can review hotels.
Embassy Suites by Hilton
JW Marriott
Fairmont
DoubleTree Suites by Hilton
Here's a link to a map with an overlay of hotels at a variety of prices: