I hope you dont mean that you are planning on having mixed dancing at your wedding. Of course your husband is upset. Besides for the fact that its inapropriate for you to be working as a single girl with non Jewish people (especially men), why would he want them at your wedding too?? The fact that your husband has a phobia of blacks is a separate issue. But knowing this, you should be especially sensitive to this issue. Now that you are getting married its a time to reflect on what is an appropriate work environment for a proper bas yisroel.
Wishing you all the best on your marriage!