Short answer
Your written quotation confirms the delivery schedule for this dresses commission, including cloth, production and destination. Sydney's proposed visit window is OCT · NOV · MAR · APR; dates and venues are confirmed individually.
For an event date, your written quotation confirms the schedule for cloth, production and delivery before you order.
Sydney's window
The proposed OCT · NOV · MAR · APR visit is the planning point for Sydney commissions. Dates, venues and available appointments are confirmed individually in writing as the month approaches.
The itinerary is a proposal: months are planned, dates and venues confirmed individually. Final quotations are confirmed in writing before you commit.