Friday; KUROSAWA TO PAKULA
By Eleanor Blau
Two film events begin today. The uncut, 208-minute version of Akira Kurosawa's ''Seven Samurai,'' with Toshiro Mifune and Takashi Shimura, opens at Cinema Studio 1, Broadway, near 66th Street, in its first New York run. The Japanese classic, about a warrior band that protects a farm village from marauders, was released in the United States in 1955 in a 158-minute version. Admission: $5. Information: 874-8989. And, the Museum of Modern Art, 11 West 53d Street, opens a series of films produced or directed by Alan J. Pakula, starting with his first, ''Fear Strikes Out'' (1957), at 2:30 P.M. and ''Klute'' (1971), introduced by Mr. Pakula, at 6. Free with museum admission: $3 ($1 for children and the elderly; pay what you wish on Tuesdays). ART IN CHILDREN'S BOOKS To celebrate children's book illustration as a fine art, the Master Eagle Gallery, 40 West 25th Street, has opened a free exhibition of original art from books published this year. On view are 200 works - pen and ink, watercolor, oils, acrylic, gouache and pencil - by more than 150 artists, including Edward Gorey and William Steig. The subjects range from fantasy to technology: penguins on ice skates to a cross section of a barge. You can also learn how pop-up books are made. Open Monday through Friday, 9:30 A.M. to 4:30 P.M.