Vajiralongkorn, 66, inherited the crown following the death of his father, King Rama IX, in 2016, becoming King Rama X. He is the 10th member of the Chakri dynasty, which has ruled Thailand since Rama I took the throne in 1782.
The coronation ceremonies will include a mixture of sacred Hindu and Buddhist rituals that date back centuries.
Gathering at Sanam Luang
Though much of the royal coronation will happen behind closed doors at Bangkok's famed Grand Palace, it will be televised/live-streamed, and there are a variety of opportunities for the public to take part in the celebrations.
For many Thais, this will be their first chance to experience a coronation. King Rama IX took the throne in 1950 and was the world's longest-reigning monarch prior to his 2016 death.
Thousands are expected to gather at Sanam Luang, a historic field adjacent to the Grand Palace, over the May 4-6 coronation period.
A young Thai man holds a portrait of King Rama X on May 1, 2019 in Bangkok.
Lauren DeCicca/Getty Images AsiaPac/Getty Images
According to officials, free food and water will be handed out while rest areas and mobile toilets have been set up to facilitate the expected masses at Sanam Luang.
Schedule of events
May 4 -- Royal Coronation Day
This is the official coronation day, when the most important rituals will take place at the Grand Palace. (Normally open to the public, the Grand Palace and its Temple of the Emerald Buddha will be closed over the coronation period. See below for info on additional attraction closures.)
Again, though these events will take place behind closed doors they will be broadcast live on Thai television networks and online.
On this date, the King will take part in a Royal Purification Ceremony, which involves being anointed in sacred waters gathered from Thailand's 76 provinces.
Then, he will be seated under the nine-tiered Umbrella of State -- a symbol of full sovereignty -- and presented with various royal regalia.
Later that day, the king will grant an audience to members of the royal family and senior Thai officials.
May 5 -- Public Procession
At about 4:30 p.m., King Rama X will tour the area around the Grand Palace on an ornate royal palanquin and stop at three major temples -- Wat Bovoranives, Wat Rajabopidh and Wat Phra Chetuphon.
According to officials, Vajiralongkorn will pay homage to the main Buddha images at each temple, before returning to the Grand Palace.
Large crowds are expected to line the seven-kilometer procession route to greet the king.
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Monday, May 6, has been declared a public holiday so government offices and some banks will be closed.
At 4:30 p.m., the King is scheduled to greet the public on a balcony of the Suddhaisavarya Prasad Hall inside the Grand Palace.
Celebratory shows will kick off at Sanam Luang from late afternoon. These include a drone light and sound display -- see the above video of the rehearsal -- around 7 p.m.
Volunteers walk in front of the Grand Palace before a rehearsal for the royal coronation of Thailand's King Maha Vajiralongkorn.
LILLIAN SUWANRUMPHA/AFP/AFP/Getty Images
Impact on local travel
All of the coronation activities will take place in the city's Rattanakosin area.
Often referred to as "Old Town," it's a popular destination for tourists due to the high concentration of historic attractions as well as hotels, restaurants and bars in the Khao San Road and Phra Arthit Road neighborhoods, among others.
In addition to the Grand Palace, which will reopen May 7, other attractions set to close over the coronation period include the National Museum of Bangkok, the Queen's Gallery, National Gallery, the City Pillar Shrine, Museum Siam, Pipit Banglamphu Museum, Coin Museum, King Prajadhipok Museum, Wat Saket (Golden Mount) and Rajadamnern Boxing Stadium.
Wat Pho and Wat Bowonniwet Vihara are only closed on May 5, while the Rattanakosin Exhibition Hall is closed May 5-6.
More than 30 area roads will be shut to traffic at different times from May 2-6 as well, including Ratchadamnoen, Sanam Chai and Maharat. Travelers should expect major traffic delays and are advised to use public transportation when possible.
Outside of Rattanakosin, Bangkok is expected to be up and running as normal over the coronation period, with bars, restaurants and malls open for business.
Royal Barge Procession
The last Royal Barge Procession took place in Bangkok in 2012.
CHRISTOPHE ARCHAMBAULT/AFP/AFP/Getty Images
Not going to be in Bangkok for the Royal Coronation Ceremony this weekend?
There will be one more chance to experience the celebrations later this year. Though the exact date hasn't been announced, we do know a Royal Barge Procession will take place in honor of King Rama X on Bangkok's Chao Phraya River in October 2019.
If past processions are any indicator, it will be an incredible scene involving about 2,300 oarsmen, who will row over 50 barges from the city's Wasukri pier to dramatic Wat Arun -- a total length of four kilometers. The rare spectacle is heightened by rhythmic barge-rowing songs.
In the meantime,