Oak Park is also home to WPNA, broadcasting from the former Oak Park Arms Hotel at 1490 AM since 1951. Run by the Polish National Alliance, the station's programming serves the diverse linguistic and cultural communities in the Chicago metropolitan area (in the late-1960s, WPNA had the only "underground" disc jockey in Chicago, Scorpio). The Oak Park Art League (OPAL), a nonprofit visual arts center founded after World War I (renamed in 1970), provides classes, workshops, lectures, demonstrations, and exhibitions. Since 1921, OPAL has been providing opportunities for arts engagement and cultural enrichment. Over 4,500 artists participate in OPAL's events each year.