The town’s Cultural Council and the Wrentham Developmental Center are teaming up to organize a “trash mob” to create a sculpture out of recycled materials at the center on Emerald Street. Volunteers for the “Aliens’ Garden’’ project will assemble Aug. 4, from 1 to 4 p.m., with a rain date of Aug. 11. Sign up by calling the council at 617-335-6121 or e-mailing wrenthamculturalcouncil@gmail.com. For more information, visit the council’s website, www.wrenthamculturalcouncil.shutterfly.com.