June - The Summer Solstice Lavender Festival is a must-attend event for the nature lover and conservationist. Spend part of the day picking lavender at Ohio's largest lavender farm. Attend workshops, meet with holistic health practitioners, listen to Native American music, sample foods made with lavender and shop a wide array of lavender-based products. Be sure to tour southwest Ohio's only earthship and learn how this family farm festival has evolved. Mid-June.