LBJ's 60th birthday; Lady Bird watched Democratic National Convention until 3 a.m.; Lady Bird talks to Lynda Robb on phone; Mrs. Richard Daley invites Lady Bird to luncheon in Chicago; LBJ & Jake Pickle swim; Liz Carpenter calls with Convention update; Johnsons to Luci's house for "press" birthday party; LBJ cuts cake & opens gifts; back to LBJ Ranch for birthday party; Lynda Robb arrives; dinner in front of three tvs watching convention; Vietnam plank of platform; Pat Nugent & Chuck Robb in Vietnam