Hi Kia!
I've had success in the past with volunteer fairs at colleges, as Lindsay has.
I'd also suggest reaching out to the volunteers you have now. As civic minded people, they are often involved in multiple community groups. See if any of them can help you connect with the other organizations they are part of, and if they can help you find an outlet to present to those groups. Even just 10 minutes before a meeting can help. If you can't make their meetings, see if you can empower your volunteers with an elevator pitch for your organization and some applications, ans have them help you recruit.
Hope this helps!
Samantha Arceneaux