The headliner Tuesday is New Jersey Gov. Chris Christie, once considered a potential running mate for Romney. Ann Romney, who was set to speak today, will also speak Tuesday.
Meanwhile, on the sidelines of the convention will be a veritable sideshow of GOP presidential also-rans.
Unbowed by the weather and by his losing presidential campaign, supporters of Texas Rep. Ron Paul came out in droves to hear him speak Sunday in Tampa, after he was nixed from speaking at the convention. Other one-time candidates -- Newt Gingrich, Herman Cain and Minnesota Rep. Michele Bachmann -- are also expected to hold events on the convention sidelines.
Democrats also have set up outside the convention, hunkering down in a "war room" to respond in real time to comments made during the event.
ABC News' Josh Haskell contributed to this report.