Events have two Leaderboards - Global and Group.
The Global Leaderboard is a Leaderboard ranking all DomiNations players, while the Group Leaderboard is a Leaderboard ranking a group of players. (Broken out by Age.)

There are brackets for each Leaderboard for players to earn rewards. The higher you rank on either Leaderboard at the end of the Event, the better the reward you will receive.