KIDS' WEEK AT THE THEATRE is back, and it's bigger and better than ever. The third annual event takes place throughout Los Angeles county from April 30 to May 7, 2000. For eight days, theaters from North Hollywood to Long Beach, San Gabriel to Santa Monica, will offer free tickets, backstage tours, open rehearsals and hands-on workshops for youth 18 and under. To date, 46 different events have been scheduled by 39 companies and new groups continue to come on board daily. For more information or a complete schedule of events, call 310-281-1910 or visit the website.