For your Hippies party theme, here is a game idea that can be altered to fit the Hippies party theme.
Check out Hippies
Party Games for more free party games. Long hair, rock and roll, peace signs, and headbands are symbols of the era of Hippies.
FAMOUS TV SHOWS DURING THE HIPPIE ERA: Write down the last names of at least 20 famous sixities TV personalities. Have the guests put in the first names. Give only about 5 minutes to guess the names. Then read the first names and the TV show that they were from. It's a fun game to play, who ever gets the most wins the game.