What's happening in Madame Vaussart 's lonely hearts club?

Every Wednesday night,seven persons have diner together at Mrs Vaussart 's lonely people club :three men and four women: a store-keeper,a punch card operator,an old singer,a movie theater employee,a Paris city transport authority employee,a former firebrand and a widow.They go for a walk in the Saint-Cloud Parc ,they locate the premises on an Ordnance Survey map.The following Sunday ,dressed up to the nines ,armed to the teeth ,the seven lonely people are on their way to the Park.What are they planning to do?—dbdumonteil