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No mention of his dance partner, Mia Farrow?
No mention, because it's not MF. The real question is: Where is Maureen?
That is INDEED Mia Farrow. She dyed her hair dark since India. Ringo also danced with Elizabeth Taylor this night. One photo of that can be seen in the White Album poster.(MarkZapp)
March 23, 1968 - Ringo and Maureen attended a screening of the re-issue of Around The World in 80 Days and afterward a party at the Dorchester Hotel. Ringo is dancing with Mia Farrow in these photos and was also photographed dancing with Elizabeth Taylor. None of the other three Beatles had yet returned to London from India.