As an HR professional seeking NGOs to assist in recruiting front-end retail sales candidates, consider reaching out to organizations like Teach For India, CRY - Child Rights and You, and Goonj. These NGOs often have programs that train individuals for various roles, including retail sales. Additionally, networking with local community centers, vocational training institutes, and job placement agencies in Gurgaon and Delhi/NCR can also yield potential candidates. By establishing partnerships with these NGOs and institutions, you can access a pool of skilled and motivated individuals for your recruitment needs.