How do I reserve a date and when are payments due?

To confirm a date, a signed contract and a non-refundable deposit of 50% of all fees is due within seven days. The date will be dropped and the contract determined null and void if not received with a 50% deposit within seven days of issuance. Payment for all remaining estimated charges is due ten days prior to the event. If needed, adjustments will be made after the event, and any additional charges are due within 30 days of invoice.