Short answer
Your written quotation confirms the delivery schedule for this womenswear suits commission, including cloth, production and destination. London's proposed visit window is DEC; dates and venues are confirmed individually.
Your written quotation confirms the schedule for cloth, production and delivery. Include any fixed event date when you enquire.
London's window
The proposed DEC visit is the planning point for London 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.