As you build your event program/agenda, you may want to preview your agenda. Previewing allows you to see both "Draft" and "Published" sessions, and can be very useful for determining how a "Draft" session will appear before making it "Published".
Sessions marked as "Draft" will appear with diagonal lines in the background on your preview.
Previewing your agenda
Go to Setup > Program > Sessions
Click the 'Tools' dropdown
Select "Preview..."