* Three-day event is part of AARP's National Event & Expo, September 22nd-24th * WASHINGTON, Aug.

The Screen Actors Guild says the celebrities who support its call for passage of a tentative contract include U.S.

Hollywood actor Emilio Estevez has signed up to guest star on an upcoming episode of "Two and a Half Men," CBS announced Thursday. The sit-com stars Estevez's real-life brother, Charlie Sheen. Estevez will play character Charlie's former drinking and partying buddy who drops by for a visit.

Actor Sean Penn escorted activist and San Francisco congressional candidate Cindy Sheehan to the San Francisco premiere of his new film "Milk." Penn, a San Francisco resident, plays the title character in the film about the life and assassination of San Francisco Supervisor and gay-rights leader Harvey Milk.

SAN FRANCISCO, Oct.