first, here "main", is the name of the event category. It is also the name of
the channel the event will go in. The second, here "myevent" is the name of the
event. The third is a format string that announces the names and the types of
first, here "main", is the name of the event category. It is also the name of
the channel the event will go in. The second, here "myevent" is the name of the
event. The third is a format string that announces the names and the types of