Techniques are described for using computing devices to perform automated operations involving interactions between multiple computing devices and systems as part of automatically scheduling an in-person access to a physical property involving multiple unaffiliated users traveling from disparate locations to the physical property, such as for an access to a house or other building. In some situations, the automated operations include exchanging electronic communications between computing devices to provide multiple sequential telephone call interactions and concurrent in-application interactions with multiple candidate users regarding participation in the group.