King Charles III Coronation

King Charles might have to get on the mic and croon a tune at his own coronation if Buckingham Palace can't find big-name talent ... which they're reportedly struggling to do.

According to multiple British media outlets that say they're in the know on this, Charles and co. have whiffed on some major players that could've potentially been booked for the May ceremony ... where KC will be officially crowned as the new sovereign in all his glory.

The Sun reports that 3 HUGE stars apparently told the Royals, of late, that they're unable to attend and/or perform ... including The Spice Girls, Harry Styles and Sir Elton John (who's a knight, no less). The reason for preemptively getting out of it ... conflicting schedules.

In Elton's case, he's on his farewell tour ATM ... and around early May (when the coronation goes down) he's actually scheduled to do a slate of shows in Germany before and after the ceremony. Per the Sun, going to and from in that short window isn't feasible.

As for Harry -- who's also touring, and never seems to really stop -- he technically has availability in early May to potentially squeeze in a BP gig ... but the Sun says it's going to be too hard for him to get bandmates together for that, and that they need "downtime."

And, when it comes to the Spice Girls ... apparently, it's too many schedules for too many ladies. That's about all the Sun has to say about that -- so, they ain't performing either.

Of course, there's also Ed Sheeran and Adele ... whom the Palace also reportedly approached, only to be shot down. DM reports both told the King they couldn't do it -- with Ed citing touring conflicts, and Adele apparently not offering (or having) a specific reason.

So, who's actually going to do the gig? At this point, the British media seems to be in agreement that Lionel Richie, Take That (minus Robbie Williams), Olly Murs and a handful of other not-as-famous music acts are in line to step up and carry the torch for HRH.

King Charles may have a scaled-back coronation in May -- a theory being floated after the official plans for the ceremony were released  ... but the question is, why not go big???

On Saturday, Buckingham Palace dropped the dates, times and schedule of events for His Royal Highness' crowning/induction as the next monarch -- which is happening on May 6 ... but it'll be marked by a 3-day celebration that runs all the way through that Monday.

The coronation itself will take place at Westminster Abbey, where a "solemn religious service" is to be held, but at the same time ... BP also says it'll be an occasion for pomp and circumstance. The Archbishop of Canterbury, Justin Welby, will preside over that part.

The following day, Sunday, there'll be a major concert at Windsor Castle as well as a massive lunch that'll apparently be held for all throughout the U.K. On Monday, there's going to be a bank holiday for Brits -- plus, a charity event that's community service-oriented.

Then, there's a line from Buckingham Palace ... emphasizing what the coronation might look like big picture. They say, "[T]he (coronation) Service will reflect the Monarch’s role today and look towards the future, while being rooted in longstanding traditions and pageantry."

This is part that's getting dissected as far as what it could possibly mean -- and some, it seems, are speculating it'll translate to a more succinct and less extravagant affair ... certainly less lengthy and fussy than what his mother, Queen Elizabeth II, received in 1953.

The reason ... optics. At least that's what's being reported in the press -- apparently, the King doesn't want to rub the monarchy's wealth and embellishments in the faces of everyday Britons ... especially amid the current economic state of things, with a looming recession.

While that seems to be the official rationale being dished by Palace insiders ... one's gotta assume his son, Prince Harry, is also a factor if he follows through with this subdued approach to the coronation. Fact is ... PH didn't paint his dad in the greatest light lately.

In both his book, 'Spare,' and in his and Meghan Markle's Netflix docuseries ... the Royals are portrayed as an ancient and out-of-touch institution, with an unsavory history to boot.

Prince Harry's been making a lot of claims about his brother lately -- and the repercussions for going against the family, as they say, is apparently not all that bad ... per a new report.

The Times published a story Saturday that claims to have some inside knowledge on how the Royals are digesting Harry's bombshells ... which have been leaking out via excerpts from his forthcoming book, "Spare," due to release next week.

According to the outlet, the only thing PH faces at this point for spilling his guts is being "written out of the script" for King Charles' coronation ceremony in May -- when he's officially crowned and all that jazz. That doesn't mean the Duke can't attend, though.

The Times' Royal Editor, Roya Nikkhah, tweeted this tidbit as a follow-up to her post ... "I can also reveal that Prince Harry has been written out of the script for the Coronation, with no official role in the service if he attends. Breaking with tradition, Charles will scrap royal dukes kneeling and paying homage to the monarch. Only William will perform that role."

So, it sounds like Harry can, in fact, roll through if he wants ... but will have to sit in the peanut gallery with all the others, while Prince William takes center stage next to Dad. All things considered, that's mild. Some speculated Harry would be uninvited altogether.

As for Willy ... The Times claims, through Royal sources, that he's "burning with anger" over Harry's assertions -- namely, that he allegedly attacked his brother, insulted his wife, Meghan Markle, and encouraged him to wear that Nazi costume all those years ago.

And yet, he's staying silent through it all ... which he apparently plans to continue doing for the foreseeable future. Time will tell if even more nuggets emerge when the book comes out.

As we know, Harry's on a full-blown press run right now to promote this thing. Word is, Penguin -- which reportedly paid him $20M for "Spare" -- needs around 1.7 million copies to be sold just to break even. Here's hoping the best deets are still under wraps.

To invite or disinvite -- that's the question facing King Charles as it pertains to Prince Harry and Meghan Markle attending his coronation next year ... and there's a lot of opinions.

Now that the couple's Netflix doc is out (at least in part), many have wondered what'll become of the King's big ceremony next Spring -- namely, are the Duke and Duchess going to be asked to come, or on the flip side ... explicitly told they're not welcome?

Several so-called Royal experts have weighed in over the past few days -- and the consensus seems to be ... it depends on what else comes out in their series.

So far, there hasn't really been any real bombshell accusations hurled toward the Royal family that we weren't already aware of. In the first three episodes of 'Harry & Meghan,' the couple has mostly recounted how they met and navigating the U.K. press/Royal life early on.

While the first official trailer seemed to promise some harsh criticism of the senior members -- including Prince William and Charles -- the doc's been relatively mild of late. The second half, which is set to air on Dec. 15, is sure to include more incendiary content ... that is, after they cover Meghan and Harry's first wedding dance, which Netflix teased with a new clip.

Now, if Harry and Meghan go into further detail about their racism allegations relating to their son, Archie, it could easily blow up their chances at being invited to the coronation in May ... which, as of now, is actually scheduled on the kid's 4th birthday to the date.

Unclear whether that was intentional or not, but it certainly seems fishy. At any rate, neither party has officially commented on any plans for Harry and Meg to attend or not ... but some insiders have claimed that Charles' wife, Camilla, has expressed wanting them there.