On the 50th anniversary of the Fab Four's first appearance on "The Ed Sullian Show," CBS airs The Night That Changed America: A Grammy Salute to the Beatles (Sunday, 7 p.m., Ch. 2).And it is the exact 50th anniversary - day, date, time, network.The 2½-hour special also includes David Letterman interviewing Paul McCartney and Ringo Starr on the stage at the Ed Sullivan Theater where they performed half a century ago. And the two surviving Beatles also perform, and contemporary artists sing the Beatles' greatest hits.Very cool.Friday on TV ...NBA (6:30 p.m., ROOT): Utah Jazz at Dallas MavericksWomen's college gymnastics: BYU at Utah State (7 p.m., BYUtv); Arizona at Utah (7 p.m., P12N)American Masters (8 p.m., PBS/Ch. 7): A profile of Alice Walker, the first black woman to win a Pulitzer Prize for literature.Enlisted (8 p.m., Fox/Ch. 13): Cody asks Jill for help with a private matter.Helix (8, 9, 10 and 11 p.m., Syfy): Alan and Jordan make progress in decoding the virus.Raising Hope (8:30 p.m., Fox/Ch. 13): Virginia takes Burt to a dude ranch.Saturday on TV ...Atlantis (7 and 10 p.m., BBC America): Jason is reminded of his promise to Circe.NBA (7 p.m., ROOT): Miami Heat at Utah Jazz Black Sails (7, 8:05 and 9:10 p.m., Starz): Silver and Billy tackle a morale problem.Men's college basketball: Boise State at Utah State (4 p.m., CBSSN); Washington State at Utah (6 .m., P12N); San Francisco at BYU (7 p.m., BYUtv)Sunday on TV ...Women's college basketball (1 p.m., P12N): Utah at Oregon StateThe Walking Dead (7, 9 and 10:30 p.m., AMC): As the second half of Season 4 begins, Rick deals with old wounds.Downton Abbey (8 p.m., PBS/Ch. 7): Mary and Blake have a bonding experience that involves sick pigs. Really.True Detective (10 p.m., HBO): Hart and Cohle follow a series of leads.Shameless (10 p.m., Showtime): Fiona's bad decision catch up with her.Sister Wives (10 p.m., TLC): Another family tragedy strikes.Girls (11 p.m., HBO): Hannah gets a job writing advertorials.House of Lies (11 p.m., Showtime): Marty and Jeannie plot to remove Lukas.Looking (11:30 p.m., HBO): Patrick joins Agustin at the Folsom Street Fair.Episodes (11:30 p.m., Showtime): Merc steals his ex-wife's artwork, and Matt comes to her rescue.