Max Said Yes! The Woodstock Story by Abigail Yasgur and Joseph Lipner, illustrated by Barbara Mednes

From chapters.ca:
With lively verse and illustrations reminiscent of the era's album covers, this tale commemorates the historic three- day music festival that became a symbol of the peace and love mantras of an entire generation: Woodstock. Dairy farmer Max Yasgur made rock ’n’ roll history when he allowed a group of flower children to gather on his farm. Thousands from across the land flocked to listen to the rock groups of the day — the Grateful Dead, Richie Havens, Jimi Hendrix, Janis Joplin, and Santana. They pitched a tent village, danced joyfully in front of the giant stage blasting music celebrating the Aquarian age; and when it was over, they set out to rebuild the universe.