BABES IN ARMS'. This Broadway musical made famous by Mickey Rooney and Judy Garland .The prototype of the familiar ''Let's-put-on-a-show-in-the-barn!'' is an ideal vehicle for the youthful talent. A funny, exciting,'feel-good' show with classic standards including 'The Lady is a Tramp' and 'My Funny Valentine' promises another memorable evening of entertainment for all of the family.