Area nonprofits are looking for helping hands and the Greater Haverhill Chamber of Commerce is acting as matchmaker Tuesday. Potential volunteers are invited to peruse the needs, ask questions and consider hoe they may help. Chamber President and CEO Katie Cook, who appeared last month on WHAV’s “Win for Breakfast” program, explained how it works. It’s at the Riverside Church here in Haverhill and it’s Sept. 16, from 4 to 7, and you just come. Another way the Chamber seeks to help nonprofits is by helping them avoid scheduling competing events.