seventies
From or evoking the 71st through 80th years of a centuryFrom or evoking the 71st through 80th years of a century (chiefly the 1970s).
US/sˈɛvəntiz/
Meaning
1 senses(not comparable)From or evoking the 71st through 80th years of a century (chiefly the 1970s).
I know the theme of the school dance is "The 1970s" but is covering the walls, floor, and ceiling with tie-dye too seventies?