I am looking for a cross platform app that will give a specific group information about a yearly event. Information such as whats going on, where it's happening and what time it's happening. This event happens every year at different places so the information changes. I am looking for something that is easy to update because of this. Log on required as this is not a public event. Updated information on app to be sent to app, text,email if user defined. A way for useres to say that they have arrived at the event and where to meet.