Get ticket availability and schedules for a date range

Returns the dates, timeslots, remaining capacity, and indicative prices for ticket and package products between fromDate and toDate. A package lists the start times every one of its components can honour, priced as the sum of its components (see items). This is availability data with no customer context, so it is cheap to call and safe to cache; use it to build a calendar or date-picker. It does not reserve capacity and the prices shown do not reflect any customer-specific discounts. Note that a single product can have several admissions, each with its own schedule and price. Narrow the results with the category and skus query filters; an unknown category or SKU is not an error — it just returns no results.