Start before the guests arrive
People setting up furniture, food and activity areas may need facilities earlier than the invitation time. Explain which household bathrooms they can use and where temporary equipment could stand. Discuss washing and the guest route without relying on access through private rooms.
Keep a plan for the morning after
Cleanup may continue beyond the main gathering. Tell the business when facilities are last needed and ask about collection windows. Preserve the agreed approach and a reachable host rather than assuming that a short occasion requires or guarantees immediate removal.