Related Clues:

• 60's protest
• 60's event
• Hippie gathering of a sort
• Hippie celebration
• “Hair” tune
• Happy hippie happening
• Hippie happening
• 60's happening
• Hippies' gathering
• '60s hippie gathering
• 'It's not easy ___ green'
• See 1 Across
• "Oh, to --- England ..."
• '___ Green' (Kermit the Frog song)
• '60s protest of a sort