Newsom is currently campaigning in the Bay Area, where he will be joined by Vice President Kamala Harris at a rally Wednesday. President Joe Biden will stump for Newsom in California sometime "early next week," White House press secretary Jen Psaki said.
Meanwhile, conservative radio talk show host and leading GOP contender Larry Elder is set to appear in South El Monte on Tuesday before heading to Northern California.
Businessman John Cox is expected to make a campaign stop in Modesto, and former San Diego Mayor Kevin Faulconer will hold an press conference via Zoom.
Newsom and Elder have not met in a formal debate, but they've had strong words for each other on the campaign trail.
Recall election: Biden to campaign for Newsom in Calif. next week
"This man, Gavin Newsom, shut down this state while ignoring science," Elder told supporters in Castaic, "at the French Laundry restaurant, with the very people that drafted the mandates that he was not following."
Referring to Elder, Newsom told voters: "He said before his first cup of tea after getting sworn in, that he'll use the power of an executive order to eliminate mask wearing in the state of California for all our public kids.
"But he would do the same by eliminating any vaccine verification for public health employees and health care workers," the governor added.
Election Day is Sept. 14 but early voting is already underway by mail and at in-person polling places statewide, including more than 100 sites in Los Angeles County.
Mailed ballots must be postmarked by Election Day. L.A. County's polling places are open from 10 a.m. to 7 p.m., and will remain open for early voting until Sept. 13.