Short answer
Your written quotation confirms the delivery schedule for this womenswear suits commission, including cloth, production and destination. Brussels's proposed visit window is MAY · OCT; 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.
Brussels's window
The proposed MAY · OCT visit is the planning point for Brussels 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.