1. A method, performed by a core network entity implementing a group event processing entity in a point-to-multipoint-enabled communication system, for receiving and processing group event notifications, the method comprising: receiving, by the core network entity, a group event notification pertaining to an asynchronous group event occurring during a group session established to transmit media using a group access network resource comprising one of a multicast and broadcast bearer; determining, by the core network entity and based on the group event notification, a set of applicable policy rules that control group membership or the group access network resource for the group session; transmitting, by the core network entity to a group policy and charging enforcement function, an event message based on the group event notification, wherein the event message is transmitted over an interface established directly between the core network entity and the group policy and charging enforcement function and wherein the event message comprises the determined set of policy rules wherein the group event notification comprises an indication that a member user equipment of the group session has switched from a group transport to a unicast transport.