The celebration was in the morning. They could have attended if they wanted. But the SRH has started a process of “britanization”, let’s say. The less they mingle with other Royal Houses, the better. Only when strictly necessary, that is the rule. That is, when the invitation comes from another monarch, like in the Dutch or Danish Birthdays. But not for Crown Princes or baptisms, for example.
And I suppose the “showing her true colours” incident has also played a role.

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: As for the Spanish, they are also a bit more
: "hit and miss" about attending
: foreign royal events than other European
: monarchies. I was a bit surprised, though,
: in this case, because I was under the
: impression that King Felipe is friendly with
: Crown Prince Frederik, so I thought the
: former might want to attend the latter's
: celebration for personal reasons.
:
: I believe the King and Queen of Spain were
: busy celebrating the Day of the Armed
: Forces.
:
: I found it interesting that Liechtenstein
: was represented by not Monaco.
:
: Monaco royals are rare guests in Denmark,
: but Albert and Charlene might have been
: invited just like the Liechtensteins.
: However, it has been suggested that the
: Monaco Grand Prix could be the reason for
: their absence.
: