Thank you for the information about the invoice.
According to the contract, page 2 paragraph D, "Payment Schedule and Procedure" the "50% balance payment is to be made within 2 month before show days."
Based on that contract clause, the balance payment would be due on July 20, not March 1st.
Also please note that I need an invoice (a piece of paper sent by post) otherwise our accounting department can't pay. Please make sure all the details on the invoice are correct, including the due dates.