Please use this form if you have a customer service issue or question. A member of our team will respond to you as soon as we are able.
C4’s office hours are Monday through Friday, 9 AM to 5 PM Eastern Standard Time. If your message is received outside these times it will answered as soon as office hours resume.
Please note that this form is NOT used to request to be added to our mailing lists. For questions or information regarding exhibiting, sponsorship or marketing opportunities, faculty opportunities, or how to attend please use this form instead.
1560 Sherwood Ave. SE
Grand Rapids MI 49506
C4 is open Monday through Friday, from 9 AM to 5 PM Eastern Standard Time.