Let me catch you what happened on the hour that you missed...
"Live from the Kodak Theater, it's the AI Pre-show special"
They had Jennifer Love Hewitt introducing acts at the outdoor concert (LaToya, George, Jasmine) and some girl from a past AI who interviewed B-celebrities (I don't know what she asked because I fast-forwarded). You got Seacrest interviewing Diana, who was surprised by having a TV showing her a live feed into the Georgia Dome where some past AI contestant interviewed the gov of georgia (later on she interviews Diana's choir teacher). Same treatment for Fantasia (Clay interviews mayor of her hometown and later on interviews the county commissioner). Seacrest goes on to interview the judges.
