Cowin was a trustee of the center, which had long been promised his collection.
He is a trustee of the medical center and a former president of its medical staff.
He had served as vice chairman and a trustee of the center for almost 20 years.
Cheryl and Michael Minikes, trustees of the medical center and clients of Mr. Alpert's, covered the costs of the room.
On a recent afternoon, many museumgoers lunched first at Julia's Kitchen, the museum's main restaurant, which is named for Ms. Child, an honorary trustee of the center.
Miss Jablonski, who wanted to be a doctor but fainted at the sight of the dissection of animals, was a trustee of the center.
Mr. Perelman, who bought Revlon in 1985 for $1.8 billion, has been a trustee of the medical center, at First Avenue and 32d Street, since 1982.
Robert Motherwell, the painter, and Stanley Kunitz, the poet, both trustees of the center, are among those scheduled to speak at a 4 P.M. program at the center.
The bride's mother is a trustee of the Washington Institute for Near East Policy, a research center.
Suzanne Waxenberg, a trustee of the center, and her husband, Alan Waxenberg, the publisher of Good Housekeeping magazine, will be honored.