Texas multimillionaire/developer Gerald Hines threw a big bash at the East Wing of the National Gallery of Art this week to unveil the model for the I.M. Pei-designed Columbia Square building, but he was nearly an hour late for his own party. He didn't show up on time for the intimate event attended by 1,100 people because his daughter's nanny insisted on allowing the 3-month-old child to finish her nap before leaving the house. You don't question your nanny . . .

This is the Jacques Cousteau birthday weekend. The famous undersea explorer, whose brilliant films have often been the best things on television, will arrive at the pier at Mount Vernon Sunday to observe his 75th birthday. And a group of celebrities expected to greet him is to include CNN's Ted Turner, singer John Denver, actor Jose Ferrer, entertainer Ben Vereen and actress Stefanie Powers. On Monday, COMSAT is sponsoring a birthday luncheon at Le Rivage on the waterfront that will include Beverly Sills and several political types, like Sen. Ernest Hollings and William Ruckelshaus . . .

The Washington Opera enhanced performances at the Kennedy Center last season by projecting English surtitles to translate the Italian and German being sung on the stage. Next week, when the New York City Opera performs "Turandot" and "Madama Butterfly" at Wolf Trap's Filene Center, English surtitles will be projected above the stage. It will make Wolf Trap one of the first outdoor performing arts centers to utilize the surtitle system . . .