CFAES’s Wilma H. Shiermeier Olentangy River Wetland Research Park will host a volunteer cleanup of the Olentangy River from 10 a.m. to noon this Saturday, April 19. The event is an early celebration of Earth Day. The park is at 352 W. Dodridge St. in Columbus. Activities will include planting trees, picking up trash and removing invasive honeysuckle shrubs. Everyone’s welcome. Free breakfast at 9 a.m.; free lunch at noon.