On Tuesday, September 26, the President will travel to the San Francisco Bay Area, California. The President will participate in a campaign reception.
On Wednesday, September 27, the President will hold a meeting with the President's Council of Advisors on Science and Technology (PCAST), which develops recommendations on science, technology, and innovation policy. The President will also participate in two campaign receptions. Later that day, the President will travel to the Phoenix area of Arizona.
On Thursday, September 28, the President will deliver remarks honoring the legacy of Senator John McCain, and the work we must do together to strengthen our democracy. The President will also participate in a campaign reception.
Additional details to follow.
Joseph R. Biden, Advisory: President Joe Biden to Travel to California and Arizona Online by Gerhard Peters and John T. Woolley, The American Presidency Project https://www.presidency.ucsb.edu/node/365293