Happy to provide some advice here, on behalf of Maggie. With any promotional event like a book signing, you’ll definitely want a Facebook event with as many friends and family attending as you can invite. This will help start the “snowball” effect of more people RSVP’ing when they see a large crowd attending.
You can also promote your Facebook event to specific users (e.g. Queens College students, or fans of the same fiction genre as your book). We have a guide on Facebook advertising that explains how to set up these targeted ads.
Other strategies you can try include posting flyers around the college, nearby neighborhood, and other bookstores nearby. You can also get in touch with the local paper, but the sooner the better. Local newspapers are usually excited to cover events like this, but need 5-6 weeks advance notice to get things properly scheduled.