The party search is the valuable one. A parent looking for a venue is booking for fifteen children and comparing three places, and that single transaction is worth a great many individual admissions.
Parents search by age, not by activity. Somewhere suitable for a one-year-old and somewhere that entertains a seven-year-old are different searches, and a centre that names its zones by age matches both.
Cost and duration are compared in advance. Admission price, whether a session is limited to two hours and what adults pay are read before anybody leaves the house, and a page without them loses the comparison.
Weekday mornings need a different audience. Toddler groups, pre-school sessions and quiet play bring in parents at home with small children, and filling those hours is what makes the rent work.