One Manero-wannabe is Raul Peralta Paredes O, who at age 52 is perhaps the most unlikely candidate. His case seems the more hopeless when he shows up at the TV studio a week ahead of time. He gets to register for the Manero contest, at least, and when asked his occupation he simply says "This," meaning "show business." He does a Manero impersonation and serves as a sort of director of a Fever-inspired floor show at a local bar with bigger aspirations. In his free time he watches the movie obsessively, memorizing Travolta's English dialogue during the Spanish-subtitled film, and he dreams of installing a glass dance floor like that in the movie in the bar. As far as his Manero mannerisms go, the spirit is willing, but the legs are weak. But he has no higher ambition than to become Tony Manero -- though he does have some lower ambitions.
Idol and idolator: Alfredo Castro (below) looks up to John Travolta (above) in Tony Manero.
You get the idea by now. There might be some suspense over whether Raul will be caught before the Festival show, except that Larrain establishes fairly early that law enforcement is more interested in tracking down dissidents than in catching real criminals. You get no sense that anyone's even aware of a murder spree going on. The only pressing questions are whether Raul will win the Manero contest and how many more people he'll have to destroy before then.
Here's an English-subtitled trailer, uploaded to YouTube by NetworkReleasing.