Humans spend a great deal of their time thinking about their future activities. In particular, we can draw upon information stored in episodic memory to construct detailed simulations about upcoming events. Future simulations have adaptive value, enhancing wellbeing, problem solving and decision making. However, if these simulations are to guide and enhance our future behaviour, it is critical that future events are not only sufficiently detailed but also successfully encoded into memory. In this talk, I will discuss recent behavioural and neuroimaging studies from my laboratory examining how constructive episodic memory processes (supported by the hippocampus and associated networks) support the simulation of detailed future events, as well as the factors that influence the encoding of simulations.