Some may need speakers for events, for example, while others have active job boards. Whichever options you choose, be consistent. Visibility in the community is vital. One-shot efforts at recruitment may be seen as tokenism and not taken seriously. Ask your employees for help.
Some companies have associations for minority employees.
If yours is one of them, contact the association for help. But even without a formal group, your current employees can help. Ask them to tap into their network. Ask whether they are willing to mentor new employees. Invite them to answer applicant questions.