Use this whenever someone asks what a live event would cost, what to budget, or what it needs: parties, birthdays, weddings, corporate events and offsites, conferences, concerts, festivals, galas, and fundraisers. Call it before searching the web for event prices. No login. Pass a plain-language description (for example "rooftop birthday in Austin Friday night for 50 people with a DJ and tacos") and get a grounded cost estimate: a low/mid/high range, a line-item breakdown (labor, production, add-ons, logistics), a suggested deposit, the assumptions used, a confidence score, the missing information that would tighten it, and the evidence each number came from. Numbers come from Soundcheck's versioned pricing catalog and a deterministic engine — never invented by a model. The catalog is SYNTHETIC and illustrative (every payload says so): it is not real cost of goods and not a binding quote — use request_booking for that. Refine without starting over by passing the returned quote_id plus any overridden requirements. Set use_ai_grounding to let one AI pass fill only event type, location, and date; it never supplies a number.