African communities (New York)

Hi, I work @Swedish VoIP company, Rebtel, and we are looking for Advertising/Marketing and /or Social Media management agencies to work with in NYC, focusing on (one or more of) these countries: Nigeria, Ghana, Ethiopia, Cameroon, Kenya and Sierra Leone. Also personalities and influencers (sports, showbiz, social media, etc). If you have any info on any of the above, please share it with me :) that'd help us a lot! 2 of our Senior Management officers will be in NYC from March 22nd to the 26th and it'd be great to meet. Thanks a bunch!
Wanda Ikeda