There are 19 examples of [amenity=parish_hall][1] in OSM - to me, that sounds about right for what you describe. EDIT: And depending on what the building looks like and how it is described, [amenity=church_hall][2] (mentioned below) might be even better. [1]: http://taginfo.openstreetmap.org/search?q=parish_hall#valueshttp://taginfo.openstreetmap.org/search?q=parish_hall#values [2]: http://taginfo.openstreetmap.org/search?q=church_hall#values

There are 19 examples of [amenity=parish_hall][1] in OSM - to me, that sounds about right for what you describe. [1]: http://taginfo.openstreetmap.org/search?q=parish_hall#values