Some remarks about generating events, e.g. in a custom traffic simulation:

• Events must be in the correct temporal order per agent, but not globally.
  An event e1 at time t1 of agent a1 must not be created after an event e2 at time t2 of the same agent a1 if t1 < t2. However, an event e3 at time t3 of agent a2 can be created after e1, even if t3 < t1. It is still good practice to ensure that all events are chronologically ordered.