Earth Day Wildflower Walk, 1 p.m., Caldwell Nature Preserve, 430 W. North Bend Road, Carthage. Adults can learn about wildflowers during this walk. cincinnatiparks.com .
Koko Earth Day Celebration, 11 a.m.-5 p.m., Koko, 318 E. Fourth St., Downtown. Shop will be sharing resources to help you make planet-loving changes, giveaways and more. Free gift with any purchase made on Earth Day.
Vinaigrette Salad Kitchen, 7747 Kenwood Road, Sycamore Township. Free flowers to first 100 guests.
Virtual Greater Cincinnati Earth Day, 9 a.m.-8 p.m., Greater Cincinnati Earth Coalition sponsors this online event, which is usually held at Summit Park in Blue Ash. cincinnatiearthday.com .
Saturday, April 24 Art & Earth Day, 9 a.m.-5 p.m., Pyramid Hill Sculpture Park & Museum, 1763 Hamilton Cleves Road, Hamilton. Painting demonstrations, lectures, guided hikes, Plein Air painting competition, kids yoga class and puppet show. Happy hour at noon in the Fretboard Beer Garden. Free admission. pyramidhill.org .
Contemporary Art Center's Spring Family Festival, noon-3 p.m., Pyramid Hill Sculpture Park & Museum Grand Pavilion, 1763 Hamilton Cleves Road, Hamilton. Art and nature-related events in the pavilion include making seed bombs, painting with natural dyes, designing a flower crown and games. Free. pyramidhill.org .
Covington's Great American Cleanup, 9 a.m.-noon various neighborhoods in Covington. Volunteer to pick up trash, remove brush, plant trees and flowers and help with general beautification. keepcovingtonbeautiful.com .
Earth Day Tree Planting, 9 a.m.-noon, Withrow Nature Preserve, Trout Lily Trailhead, 7075 Five Mile Road, Anderson Township. Plant trees and shrubs to replace area where a former cabin was removed. Social distancing, mask wearing and sanitation recommendations will be followed. Register by April 22. greatparks.org .
Earth Day Tree Planting, 9 a.m.-noon, Triple Creek, 2700 Buell Road, Colerain Township. Transitioning mowed areas along road into a more natural habitat. Social distancing, mask wearing and sanitation recommendations will be followed. Register by April 22. greatparks.org .
Earth Day Tree Planting, 9 a.m.-noon, Mitchell Memorial Forest, 5401 Zion Road, Cleves. Replacing trees that have been lost over the years as the park has been developed. Social distancing, mask wearing and sanitation recommendations will be followed. Register by April 22. greatparks.org .
Electronics Recycling Drop-Off, 10 a.m.-2 p.m., Cincinnati Recycling and Reuse Hub, 911 Evans St., Lower Price Hill. Cash only fees required for all electronic items, batteries and bulbs. $10 per carload of miscellaneous electronics, $25 per small TV/monitor, $35 per large TV/monitor, $15 per small appliances with refrigerants, $25 per large appliances with refrigerants. cincinnatirecyclingandreusehub.org .
Ephemeral Blooms in Burnet with Rama Kasturi, 10 a.m., Burnet Woods, 3251 Brookline Ave., Corryville. Join the Lloyd Library and Museum and Dr. Rama Kasturi for a spring excursion identifying blooming flowers and trees. Reservations required. Free. eventbrite.com .
GreenUp Day at California Woods, 9 a.m., California Woods, 5400 Kellogg Ave., California. Help with beautification. cincinnatiparks.com .
Native Plant Sale, 9 a.m.-1 p.m., Bowyer Farm, 2210 Mason-Montgomery Road, Mason. Buy pollinator-friendly plants grown by Cincinnati Zoo's horticulture team. Part of Klosterman Baking Company's Save Our Bees campaign. Masks and social distancing required. Plant sales happen April 24, May 8, May 22, June 12, June 26, July 10, Aug. 14, Sept. 11, Sept. 25 and Oct. 9. Appointments required. Note: April 24 and May 8 events are already at capacity. To make reservations for future sales, visit cincinnatizoo.org/horticulture/horticulture_events .
Volksmarch Celebrates Butterflies, 9 a.m., Germania Society of Cincinnati, 3529 W. Kemper Road, Colerain Township. Walkers can register anytime between 9 a.m.-12:30 p.m. and must complete trail by 4:30 p.m. Souvenir pins with butterfly motif included with $5 registration fee. Coffee and pastries for purchase. germaniasociety.com .
