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: The fact that Frederik and Mary will attend
: led to the idea the Queen might abdicate.

CP Frederik is a member of the Council of State, so of course he is invited.

: I remember that at a press conference for
: her 75th birthday (?) the Queen said she
: would never abdicate.

She has said it over and over again, so I wouldn't put my money on an abdication.

: According to the article QM II only called
: on the State Council 4 times: to announce
: her son's engagements and when a danish PM
: was dismissed...

No, there has also been such a dinner without any extraordinary reason.