If you mean the event they left for in the beginning, it was the Victory Tour
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Peeta and Katniss.Catching Fire revolves around Katniss's fake pregnancy with Peeta's child and their marriage. There is small Katniss/Gale mentioned, such as Gale's quick kiss with Katniss, but the main pairing is Katniss/Peeta.
Katniss Was Passed Out And Peeta was still in the arena
Peeta announces Katniss is pregnant (but she really isn't) in Catching Fire, the second book, but I don't know what page.
Katniss, Peeta, Haymitch, Finnick, Betee, Johanna, Cinna, Gale, Thread, President Snow
Yes he does and Katniss says yes. However both know their not ready but they were forced to do it by the capitol so they did but never got married.