Elvis fans can commemorate the 20th anniversary of the King's death by watching RTE's Network 2 tonight which is devoting most of the evening's schedule to the rock 'n' roll legend. A documentary at 9 p.m. profiles two Irish Elvis impersonators, Ken Gribben from Belfast and Ben "Slick" Somers from Finglas in Dublin, and is followed by King Creole made in 1958.