Halo 4 Tournaments Question

Hi all,
I am pretty familiar with Halo 4 but not Halo Waypoint. I know how to navigate and everything but there is one thing i don’t know how to do.
View the upcoming events calendar. I am enthusiastic to enter a few tournaments, preferably ones that are local, or you don’t have to go any where to play them. However, i have no idea how or where to do that. I live in Australia and was wondering if there is a possible way to view upcoming tournaments or join them. Also what happens when you win a tournament?
So that is all i really wanted to ask, if someone knows how to do this please answer with what it is and a set of instructions on how to do that please.
Thanks Guys.