Tech mogul Elon Musk apparently will not speak at Thursday's APEC CEO Summit in San Francisco as previously announced.

An updated schedule Thursday showed Musk's name had been removed from the program. He had been slated to speak alongside Salesforce CEO Marc Benioff in a conversation about "AI and the Future" at the CEO Summit, which is being held this afternoon at the Moscone Center in the South of Market neighborhood.

John Kerry, U.S. special presidential envoy on climate, is now listed instead.

The Musk-Benioff conversation had been one of the most anticipated panels, at least from an entertainment perspective.

"Elon Musk had a schedule change that prevented him from joining the APEC CEO Summit 2023," a spokesperson for the summit said. "We’re thankful for his offer to join the session remotely; however, it was agreed among all speakers that participation would be in person. We look forward to Elon joining us at a future APEC CEO Summit."

Musk was a guest Wednesday night at a reception and dinner for Chinese President Xi Jinping.

A query about Musk's participation sent to X received the response, "Busy now, please check back later."