Martina NavratilovaThe Pragueborn tennis pro, who came out as bisexual in 1981, is credited with having "expanded the dialogue on issues of gender and sexuality in sports," according to ESPN. "Martina was the first legitimate superstar who literally came out while she was a superstar," Donna Lopiano, executive director of the Women's Sports Foundation, said. "She exploded the barrier by putting it on the table.Entrepreneur, motivational speaker and reallife inspiration for Will Smith character in the film "The Pursuit of Happyness," Chris Gardner will impart his life lessons in a motivational seminar and Travel Channel personality Samantha Brown will inspire members with tales from her perpetual life on the road. The AARP Movies for Grownups Film Festival will continue with screenings of "My Father and the Man in Black," a documentary directed by Jonathan Holiff, the son of Johnny Cash former manager, and "Muhammad Ali Greatest Figh