It's the turn of the professional riders at the Badminton Horse trials in Gloucestershire.
The event kicked off yesterday with a grassroots championship.
Zara Phillips has had to pull out of today's competition because her horse - High Kingdom - has an injury.
It was cross country at the Badminton Horse trials in Gloucestershire today.Around 150 thousand people attended one of the biggest equestrian events in the country.
Organisers say they were lucky with the weather with the sun shining a lot more than they'd feared. Harry Meade based near Chippenham came third. Paul Tapner, riding for Australia but based near Swindon came fourth.
The best riders and horses in the world are competing for the most prestigious prize in eventing.
Our sports correspondent Matthias Kurth has spent the day at Badminton Horse Trials soaking up the atmosphere:
Riders from all over the world have descended on Gloucestershire for the first day of the Badminton horse trials.
They include Olympians like Mary King, William Fox-Pitt and Zara Phillips. Today they'll get a briefing about this year's course and the chance to walk it themselves. Many of the competitors will be hoping for selection for the World Equestrian Games this summer.
The queens granddaughter Zara Philips has retired on the third day of Badminton.
She did well yesterday [Saturday] at dressage stage but made a mistake on the cross country course on her horse High Kingdom so has pulled up.
It means she can no longer take part in tomorrow's show jumping stage.
Organisers of the Badminton Horse Trials say they could be on course for record crowds this year with more than 120,000 people visiting today [Sunday] alone.
It's much-needed good news for the South Gloucestershire event which was cancelled last year because of poor weather conditions.
But, as Karen Griggs has been finding out, the Bank Holiday weather is proving to be much kinder.
Zara Phillips put herself firmly in contention at the Mitsubishi Motors Badminton Horse Trials today with a quality dressage performance on her London 2012 horse High Kingdom.
Phillips, the Queen's granddaughter, posted a dressage score of 44.3 penalties that kept her firmly in touch with the leading group midway day two.
More than a hundred and fifty thousand people are expected for the three day Badminton Horse Trials. Organisers of the event at the Badminton Estate in South Gloucestershire hope the weather will be kinder this year. Last year it was cancelled due to torrential rain. Rebecca Broxton reports.
More than 150 thousand people are expected at Badminton Park Estate in Gloucestershire this weekend for the annual horse trials.
The three day event is one of the most prestigious in the world. The trials were cancelled last year due to poor weather.
This year the competition is tougher than ever with Olympic Gold, Silver and Bronze medallists taking part.