“Dateline” is celebrating its 20th anniversary with a special edition on Tuesday night. The show will feature Jane Pauley, Matt Lauer, Tom Brokaw, Ann Curry and Hoda Kotb revisiting some of the series’ most memorable stories. Pauley will interview Michael J. Fox, Brokaw will profile Aron Ralston, the climber who was forced to amputate his own arm, and Ann Curry will meet with the McCaughey septuplets, who first appeared on “Dateline” in 1997. Correspondents Chris Hansen, Hoda Kotb, Josh Mankiewicz, Keith Morrison and Dennis Murphy will also contribute highlights. Each host chose their favorite story, according to Lester Holt, who will host the special