Escalation events see players begin with a smaller army, adding more units and more characters prior to subsequent rounds - though they cannot remove anything prior to a later round once it has been added to their starting army. In this way, players must field an army that constantly changes over the course of an event, presenting them with fresh challenges to overcome in each round.
For example, at a two-day event, players might begin with a 1,000 point army which they use for their first two rounds. This army might then increase to 1,500 points for the second two rounds, before increasing to 2,000 points for the final two rounds.
There are a couple of things that are important to remember when running an Escalation event. Firstly, at the start of the event, players will need to submit all of their muster lists for all of the points values at which they will be playing. Secondly, the organiser will need to make sure that they have taken the increased points values into account when deciding on how long each round should last.