The disclosed embodiments provide apparatus and methods for establishing a group communications session with selected ones of a plurality of communications devices that define a call group. The apparatus includes a dispatch module operable to receive event information and communication device information associated with each of the plurality of communications devices. The dispatch module is further operable to define the members of the call group based on a predetermined relationship between their respective device information and the event information. Additional embodiments include apparatus and methods for dispatching event information to such an ad hoc call group.