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2. Every year, the Trooping the Color ceremony is expected to be attended by royals.

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Reason: The sovereign's official birthday is being commemorated with this important royal ceremony.
Exemptions: illness, important obligations
The British royal family meets annually on Buckingham Palace's balcony for Trooping the Color, a colorful military procession that commemorates the monarch's official birthday. This ceremony is a noteworthy royal occasion full of fanfare and tradition.
It is expected that royalty will be present at the annual Trooping the Color ceremony. © maziarz/Shutterstock
As part of their civic duty and as a show of support for the armed forces, the royal family is scheduled to attend this event. However, a royal might be excused if they are unwell or have a big engagement that they cannot avoid.