HackerTracker on the App Store
Plan your visit to the world’s largest security conference. HackerTracker features an on-device schedule for viewing and saving your preferred talks and events from DEF CON. The initial schedule for talks, workshops, parties, etc from the defcon.org website is included and HackerTracker will update (upon request) from the defcon-api as updates are available.
Source: HackerTracker on the App Store