Thursday: Rubio, Jeb Bush, Gingrich, Romney … and Clint Eastwood, possibly

Later in the evening, a surprise speaker will take the stage in support of Mitt Romney and Paul Ryan — there is heavy speculation that the speaker will be actor, director and former Carmel, Calif., mayor Clint Eastwood, but the GOP had not confirmed that as of early Thursday morning.

Finally, Sen. Marco Rubio (Fla.), who was seen as a potential running mate for Romney, will introduce the presumed nominee, who will officially accept the nomination and close out the convention.