Earth Day was officially on Tuesday, but if you have to wait until the weekend to observe, a celebration will take place at the Urban Ecology Center in Riverside Park on Sat., April 26.

The rain-or-shine event kicks off at 9 a.m. with morning activities including a park clean up, 4-mile hike to the lake and a presentation by the Wisconsin Focus on Energy.

The actual festival takes place from 12 to 5 p.m. and features sustainable living demonstrations such as healthy products to make, healthy and earth-friendly food choices, transportation alternatives and composting.

The groundbreaking for the new Urban Ecology Center is set for 1 p.m. and a "raising of the spider web" for the new habitat play garden, free bicycle safety check and a helmet sale are also planned for the afternoon. Plus, enjoy food, crafts, live music and a climbing wall.

Riverside Park is one block south of Locust Street, between Oakland Avenue and the Milwaukee River. For more information, call (414) 964-8505 or e-mail theurbanecologycenter.org