Do I need to register for a session prior to arrival at the event or can I choose which sessions to attend after I arrive?

You can use Agenda Builder to enroll in sessions prior to and during the conference. Most sessions at Information On Demand 2013 are open seating. This means that enrollment prior to arrival is not required and seating is available on a first come first served basis. There are some sessions, such as Hands On Labs and Usability Sandboxes, that have limited capacity. Enrollment prior to arrival is required for these sessions.