Rockville’s Croydon Creek Nature Center, at 852 Avery Road, offers several opportunities to go green in May.

Join the Rockville Brewshed, from 2-3 p.m. Saturday, May 4, as Kenny Allen, head brewer for True Respite Brewing Company, leads a streamside hike in the Hayes Forest Preserve to gather inspiration for the brewery’s next beer. Then head to True Respite to enjoy 15% off beers for hike participants 21 and over. Cost is $4 for residents/$5 nonresidents. Register for course #9027 at www.rockvillemd.gov/registration.

Learn how to save money, reduce runoff and replace weedy areas of your yard at a free RainScapes Rebates information session from 1:30-3 p.m. Sunday, May 5. Single-family homeowners and nonprofits, including religious institutions, private schools and homeowners associations, can receive up to $4,800 in rebates through Rockville’s RainScapes Rebates program. The program offers rebates for planting trees and native plants, installing rain barrels, and removing pavement and installing pervious pavers. To register, call 240-314-8877 or email rainscapes@rockvillemd.gov with your name, phone number and address. Learn more at www.rockvillemd.gov/rainscapes.

Work with a regional expert to pull invasive plants and improve the health of the watershed from 1:30-4:30 p.m. Sunday, May 5. Gloves will be provided. No registration necessary. Children under 14 must be accompanied by an adult. Student Service Learning hours are available. Call 240-314-8770 for details.