I got this postcard from Ron via Postcrossing.
He wrote he is remembering theaters like this.
Much is reported about the theater on Wikipedia.
Today the historic Fox Theatre in Detroit is the largest surviving movie palace of the 1920s with over 5.000 seats. The theatre was fully restored in 1988. But it isn't used as a cinema anymore. You can visit there different venues and concerts.
Thank you. Richard, for this postcard!