David Harbour‘s taking a step back from the spotlight, it seems … skipping a big “Stranger Things” event after a truly bizarre incident where he allegedly stole a fan’s hat.

The actor was initially supposed to attend the “Stranger Things: The Final Season Celebration” at New York City’s Paley Center Thursday … however, he’s no longer listed as an attendee on the event’s website.

A rep for the Paley Center told People he can’t make it due to a “scheduling conflict.”

The timing of the cancellation may raise some eyebrows among fans … given Harbour’s seemingly been in the news for all the wrong reasons over the past few months.

As you know … Harbour’s going through a messy divorce with Lily Allen — who seemingly spilled all the juicy details about their relationship on her recently released album “West End Girl,” including alleged sex toys she found which she claims he was using on someone else.

There were also rumors of Millie Bobby Brown filing a harassment report against Harbour for alleged abusive behavior on-set … though Brown categorically denied the rumors and even lauded Harbour as an actor and collaborator.

And, we broke the story just yesterday … Harbour was caught on video running down the street with a bar patron’s hat in a weird altercation in Encinitas, California. He later threw the hat to the ground, asked the group about the Iraq War and then fell to his knees in prayer.

A source with direct knowledge told us, “David has always been honest about managing his bipolar disorder. Wouldn’t be surprised if that’s what he’s dealing with here after working non-stop all year and having his personal life under public scrutiny. That would be stressful for anyone but even more so for someone who is bipolar.”

Worth noting … Harbour isn’t the only major cast member sitting out the event because series star Brown will also reportedly not be at the Paley Center this evening.

2:06 PM PT — Greg Biffle and wife Cristina Biffle died, along with Greg’s daughter Emma, and Greg and Cristina’s 2-year-old son Ryder. Dennis Dutton, his son Jack Dutton, and Craig Wadsworth were also killed.

Their families released a joint statement, reading in part …

“We are devastated by the loss of our loved ones. This tragedy has left all of our families heartbroken beyond words,” the statement said. “Each of them meant everything to us, and their absence leaves an immeasurable void in our lives.”

The statement continued … “We ask for privacy, compassion and understanding as we grieve and begin to process this unimaginable loss. We are grateful for the kindness and support that has been extended to our families during this incredibly difficult time.”

Legendary NASCAR driver Greg Biffle is among the dead after a fiery plane crash in North Carolina … TMZ Sports has confirmed.

The Cessna C550, a light private jet registered to a company owned by the star driver, crash landed near a runway at Statesville Regional Airport on Thursday morning, 26 minutes after the aircraft took off from the same air strip, killing the 55-year-old and others onboard.

The plane was originally scheduled to travel to Florida, but the Cessna seemed to turn back towards the airport just minutes into the flight.

Garrett Mitchell, aka YouTuber Cleetus McFarland, says Biffle and his family were traveling to spend the day with him, but tragically never made it.

Congressman Richard Hudson, a politician from North Carolina who knew the family, also weighed in on the tragic accident.

“I am devastated by the loss of Greg, Cristina, and their children, and my heart is with all who loved them,” Rep. Hudson wrote.

“They were friends who lived their lives focused on helping others. Greg was a great NASCAR champion who thrilled millions of fans. But he was an extraordinary person as well, and will be remembered for his service to others as much as for his fearlessness on the track.”

The Congressman added … “Our prayers are with their family, friends, and everyone grieving this unimaginable loss.”

It’s currently unclear who was piloting the plane, but Greg was known to be an avid flyer who often posted images from the cockpit of his Cessna jet.

On the ground, Biffle was one of the best drivers to ever step foot in a race car. He started racing for NASCAR back in 1995.

In 1998, Greg won the Craftsman Truck Series Rookie of the Year award, as well as a Series championship in 2000.

Throughout the course of his standout career, he started 515 races over 14 seasons in the NASCAR Cup Series championship, winning 19 races and finishing in the top 10 in the final Cup standings six times, including a runner-up finish in 2005. He was a perennial playoff contender.

Biffle retired from driving full-time in 2016, but the accolades didn’t stop there.

In 2023, he was named one of the 75 greatest drivers ever before being nominated for the 2026 class of the NASCAR Hall of Fame.

The NTSB is en route to the crash scene … and will lead the investigation into the fatal crash.

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