‘Rocky Horror’ is 50! We propose a toast. (You know what to do)

At midnight, they flock to an old art deco movie palace in the Detroit suburbs.

A glow-in-the-dark dragon mural lights up one of the screening rooms at the State-Wayne Theater in Wayne, Mich. There, twice a month, the Michigan Rocky Horror Preservation Society holds court, its members arrayed in corsets, feather boas, ripped jeans and lovingly detailed costumes that evoke their favorite movie’s main characters.

The Rocky Horror Picture Show turns 50 this year, with scores of groups around the world keeping its legacy alive, including this one in Michigan.

“We are the original immersive 3D movie experience,” says Becky Milanio Koupparis, the chief operating officer and director emeritus. She first dressed up in goth glam to attend a screening at age 16, in Berkeley, Calif. That was