At coronation celebrations held Sunday, anyone could wear a crown — even a dog.

A day after the gilded spectacle of King Charles III's crowning in an ancient religious ceremony, festivities took a more down-to-earth turn with thousands of picnics and street parties held across the U.K. in his honor, no fancy invite required.

Charles and Queen Camilla said Sunday in a statement that they were "deeply touched" by the celebration and "profoundly grateful both to all those who helped to make it such a glorious occasion – and to the very many who turned out to show their support."  

His son, Prince William, heir to the throne, said at Sunday's concert that service was at the heart of the "magnificent" coronation celebrations, and that his father's first words upon entering Westminster Abbey were those of service.

"Because for over 50 years, in every corner of the U.K., across the commonwealth and around the world, he has dedicated himself to serve others, both current and future generations, and those whose memory must not be neglected," William said. 

William told the crowd that he is committed to serving "you all ... King, country and commonwealth. God save the king." 

Sunday's concert was headlined by Katy Perry, Lionel Richie and 1990s boy band Take That.

The newly-crowned monarch and his wife appeared to enjoy the show as Richie performed "All Night Long," at one point getting up on their feet and swaying along to the music. Other members of the royal family, including 8-year-old Princess Charlotte and Prince George, 9, waved Union flags along with a crowd of some 20,000 gathered on the castle's east terrace.

Charlotte and her mother, Kate, the Princess of Wales, sang along as Perry, dressed in a gold foil ball gown, performed her pop hit "Roar."

"Top Gun" star Tom Cruise appeared in a pre-recorded video message, saying: "Pilot to pilot. Your Majesty, you can be my wingman any time." The mixed program also saw performances by the Royal Ballet, Nicole Scherzinger from the Pussycat Dolls, opera singer Andrea Bocelli and British band Take That.

Even Miss Piggy and Kermit the Frog made an appearance, joking with host Hugh Bonneville.

Under a leafy green canopy at Regent's Park in London, Valent Cheung and his girlfriend showed up to cheer the new king with the neighbors who embraced them when they moved from Hong Kong. They dolled up their loyal and "royal" fluffy white dog, Tino, with a tiny purple crown for the occasion.

"This is a new era for U.K," Cheung said. "We didn't have these things in Hong Kong. Now, we are embracing the culture. We want to enjoy it, we want to celebrate it."

From small villages to the capital, the Union Jack hung on houses and flew from tables and trees in celebration of the newly crowned king. It was printed on napkins and tablecloths, hats and bows. Some wore the flag's colors like a uniform — clad in red, white and blue from head to toe and extending to their fingernails.

The community get-togethers, part of a British tradition known as the Big Lunch, were intended to bring neighbors together to celebrate the crowning even as support for the monarchy wanes. Critics complained about the coronation's cost at a time of exorbitant living expenses amid double-digit inflation.  

Thousands of luncheons were organized as part of the celebrations Sunday, along with a nighttime concert at Windsor Castle.

Charles encouraged residents to engage in volunteer activities Monday, which the U.K. made a public holiday.

William and and his wife, Catherine, surprised people picnicking outside the castle before the concert. Dressed far more casually than the day before, they shook hands and Catherine embraced a crying girl in a hug.

The BIG Lunch 🥪🧃🧁 pic.twitter.com/GgvpFYBWFb

— The Prince and Princess of Wales (@KensingtonRoyal) May 7, 2023

The king's siblings, Edward, the Duke of Edinburgh, and Anne, the Princess Royal, and their spouses took on lunch duty for the royal family. Edward was in Cranleigh and his sister hit an event in Swindon. The king's nieces, Princess Beatrice and Princess Eugenie, the daughters of Prince Andrew, were to join a lunch in Windsor.

Prime Minister Rishi Sunak hosted U.S. first lady Jill Biden and her granddaughter Finnegan Biden at the Big Lunch party held in front of his office. Other guests included Ukrainian refugees and community activists.

Cheers! 

Thank you, Rishi and Akshata for welcoming me to your Coronation Big Lunch as we mark this special moment in history. pic.twitter.com/cQyNwHBeWD

— Jill Biden (@FLOTUS) May 7, 2023

Like the picnic in the park, Downing Street and Sunak's spread — even his teapot — were festooned in the nation's colors.

Sausage rolls and salmon were served along with coronation chicken — a dish cooked up for Queen Elizabeth II's coronation 70 years ago — and coronation quiche, which was picked to suit Charles' taste and has been the buzz of social media. often for the wrong reasons.

The lower-key events followed regalia-laden pageantry that saw the king and queen crowned together in Westminster Abbey. They were presented with centuries-old swords, scepters and a jewel-encrusted golden orb symbolizing the monarch's power in a medieval tradition celebrated with liturgy, song and hearty cheers of "God save the king."

The couple then paraded through the streets in a gilded horse-drawn carriage led by the largest ceremonial military procession since the coronation of Charles' mother. Some 4,000 troops marched in formation through the streets, their scarlet sleeves and white gloves swinging in unison to the sound of drums and bugles from marching bands, including one group of musicians on horseback.

Hundreds of thousands of spectators lined the route in the rain to see it in person. Nearly 19 million more watched on television in the U.K., according to ratings released by Barb, a research organization. That's about 40% fewer viewers than had watched the funeral of Queen Elizabeth II in September.

Not everyone was there to celebrate, though, and criticism continued Sunday over arrests of more than 50 protesters, including members of a republican group shouting "Not my king" and environmentalists aiming to end the use of fossil fuels.

Graham Smith, leader of Republic, a group advocating for abolishing the monarchy, said he was arrested as he planned a peaceful protest and spent 16 hours in police custody.

"These arrests are a direct attack on our democracy and the fundamental rights of every person in the country," Smith said. "Each and every police officer involved on the ground should hang their heads in shame."

The Metropolitan Police acknowledged concerns over the arrests, but defended the force's actions.

"The coronation is a once-in-a-generation event and that is a key consideration in our assessment," Commander Karen Findlay said.

In addition to the lunch celebrations, hundreds of troops marched through the center of Glasgow on Sunday to celebrate the coronation.

At Regent's Park, champagne was on ice and celebrants talked about the novelty of what they had witnessed. But the coronation was nothing new for Rosemary McIntosh, 95, just a lot more vivid than the one she saw televised while living in Zimbabwe in 1953.

"We didn't have TV all day and it was black and white, so it wasn't as wonderful as has been this one," she said.

In:
• King Charles III
• William Prince of Wales
• Queen Camilla
• Coronation