It has become an annual event. Once a year, Bill O’Reilly and Jon Stewart, seemingly polar political opposites on their respective programs, go on one another’s shows. It happened in 2010, it happened in 2011, and it is happening again this Fall.

We already noted yesterday that O’Reilly and Stewart will debate for charity October 6 (see the trailer for the debate below), but now Stewart is slated to go on “The O’Reilly Factor” this evening, presumably to talk about the debate, and whatever else O’Reilly decides is on the docket. TVNewser hears that, as usual, O’Reilly is also committed to appearing on “The Daily Show” in the next few weeks as well.

After the jump, O’Reilly talks about “The Rumble 2012″