The Annual Arbor Day Celebration sponsored by the City of Mequon will be held at River Barn Park on Sunday, April 26, 2026, from 1:00 p.m. to 3:00 p.m. Along with free raffles, there will be an art activity and a display of City forestry equipment. Be sure to check out exhibits from local conservation groups and community partners, including Schlitz Audubon, Restoring Lands, Mequon Nature Preserve, Mequon-Thiensville Historical Society, and more.