Abstract: The invention relates to a method of registering a client wireless device for an event, and to a method of alerting registered client wireless devices, which may not be connected, that the event is about to commence. Both methods take advantage of the fact that wireless devices often have permanent unique identification numbers associated with then, and that it is possible to send a timed message to a wireless device which may or may not be connected to an event server at that time. Together these steps allow a participant in a live interactive event to pre-register and enter the event with the minimum number of user actions, and without needing to remember him/herself to re-enter the event site at the appropriate time.