LBJ gives commencement address at Glassboro, New York; Lady Bird reads newspaper headlines; Lady Bird to booksellers' convention; welcoming ceremony for President & Mrs. Trejos, Costa Rica; Lady Bird names houseguests; Lady Bird to hair salon; office work under hair dryer; tea for friends; rest, office work and telephone calls; hair styled; Johnsons greet Trejos; LBJ gives humorous toast; new White House china; President Trejos' toast receives standing ovation; entertainment by Patricia Brooks