Mark Cuthbert/UK Press via Getty
May 11, 2016 01:35 PM

For the first time in its 66-year history, the Royal Windsor Horse Show in Berkshire has been canceled due to severe flooding.

Much of south-east England received half a month s worth of rain in just a matter of hours this week, and waterlogged fields surrounding the event have been deemed unusable.

Thousands of people were due to attend the event Wednesday, including Queen Elizabeth.

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The event s organizers said they plan to announce a decision on whether the event will continue as planned on Thursday.

Floods at the Royal Windsor Horse Show at Windsor Castle in Berkshire
Andrew Matthews/PA

A marketing manager for the event said that Wednesday s cancelation was disappointing, but she hopes the remaining four days will go as planned.

“We’re doing the right thing because if we can keep [Wednesday] clear we will have a show for the next four days, Jo Peck said in a statement, according to the BBC.

Happy Birthday Queen Elizabeth! It’s Your Ultimate Royal Flashback

Queen Elizabeth is a longtime supporter of the event. Even before her father was King, the horse lover was a devoted Royal Windsor Horse Show attendee.

Queen Elizabeth riding her horse at Windsor Castle on May 12, 2015
Rex USA

The Queen, who still regularly rides (she was spotted enjoying a ride around Windsor Castle last spring), attended last year s event and saw one of her own horses compete.

In honor of the Queen’s milestone 90th birthday, a parade of 900 horses on the private grounds of Windsor Castle on Thursday will still go on as planned.

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