Short answer
Your written quotation confirms the delivery schedule for this dresses commission, including cloth, production and destination. Tokyo's proposed visit window is MAR · APR · MAY · OCT · NOV; dates and venues are confirmed individually.
For an event date, your written quotation confirms the schedule for cloth, production and delivery before you order.
Tokyo's window
The proposed MAR · APR · MAY · OCT · NOV visit is the planning point for Tokyo 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.