| Business | Phone |
| Fortuna Productions 3725 N Western Ave, Chicago 60618 | (773) 478-8839 |
| Catersource Inc 2626 N Lakeview Ave 307, Chicago 60614 | (773) 525-6800 |
| Chicago Oxford Society 53 W Jackson Blvd, Chicago 60604 | (312) 786-0158 |
| Doctor's Speakers Bureau 122 S Michigan Ave 1560, Chicago 60603 | (312) 939-1364 |
| Dick Carlton Assoc 333 N Michigan Ave 2032, Chicago 60601 | (312) 726-8117 |
| Dempsey George & Co 1501 W Belmont Ave, Chicago 60657 | (773) 755-1896 |