Talks about rescheduling are already under way.
"We thank everyone in advance for their patience and understanding in completing this substantial task given the challenging practical circumstances of the current national lockdown," added Henderson.
The total attendance over five days at last year's Royal Ascot meeting was more than 290,000.
Talks are under way over rescheduling the big Classic races - which are solely for three-year-old horses - later in 2020.
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