COWI - eom.
I think the 99, seen on the Queen's real birthday, indicates Prince Philip's 99th birthday on June 10, 2020. Hand #10 on June 10, 2020 is a winning hand.
And then the King of Hearts must be the son of the Queen on People's Hearts, Prince William. His birthday is June 21, 2020. Hand #6 on June 21, 2020 is a winning hand. (And hand #6 on June 24, 2020 is yet another winning hand.)
I'll leave the deathdays, 9 and 31, for another time...