‘Killer Joe' premiere at the Paramount. Matthew McConaughey, Gina Gershon and writer Tracy Letts will walk the red carpet tonight in advance of the screening of their new violent dark comedy, "Killer Joe." Directed by William Friedkin, the movie features McConaughey as a Dallas hit man who is hired to the evil mother of a young man who is in debt to drug lords. 9:30 p.m., 713 Congress Ave.

‘Safety Not Guaranteed' premiere. Director Colin Trevorrow's feature debut stars former Austinite Mark Duplass as an eccentric loner fascinated with time travel and Aubrey Plaza of "Parks and Recreation" fame as his unlikely object of affection. 7 p.m., Paramount.

A Conversation with Joss Whedon. This will be one of the hottest tickets today at Interactive. The creator of "Buffy the Vampire Slayer" and the writer of the opening-night film "The Cabin in the Woods" talks about his career with Adam B. Vary, a staff writer at Entertainment Weekly. 11 a.m., Austin Convention Center, Room 18ABCD.

The View from Inside Rainn Wilson's Brainstem. The writer and actor will discuss his newest project, the SoulPancake website, which has crossed over into multiple platforms, from print to television to video and "real world" interactions. Wilson will talk about how art and creativity can be explored in all forms of media. 5 p.m., Austin Convention Center, Exhibit Hall 5. At 3 p.m., Wilson will sign copies of his book "SoulPancake" at the SXSW bookstore, Austin Convention Center, Ballroom G Foyer.

How to Read the World. Baratunde Thurston will discuss technology, comedy and satire. 2 p.m., Austin Convention Center, Exhibit Hall 5.