A game management system provides a generator interface that enables an operator to trigger automated generation by a content generator of a game event based on operator input values. These values include respective target values for a target metric (e.g., a difficulty level) for each of a plurality of game levels that are together to form the game event. In addition, the generator interface in some examples enables the operator to selectively vary the particular number of game levels that are together to form the game event, via an event sizing mechanism provided by the generator interface. A particular predefined group or cluster of players for whom the game event is to be tailored or customized based on multidimensional parametric player model data can also be selected in the interface.