Hi,
For this you have two options ready made.
1:
before you send the FsmEvent, setup HutongGames.PlayMaker.Fsm.EventData
create a new EventData, fill data ( string, int, etc etc), and assign it to HutongGames.PlayMaker.Fsm.EventData, it's a static property so it affects everything ( that's why you need to set it one line before sending the event.
with this you can them use GetEventInfo action as usual.
2: If your data is complex, typically with several ints or floats, you can use PlayMaker Utils ( from the Ecosystem, you may already have it).
this time you set SetEventProperties.properties, and fill it with keyValue pairs like:
SetEventProperties.properties["My Value"] = something;
then you use GetEventProperties action to retrieve "My Value" and save it into an Fsm variable
Let me know if you have more questions.
Bye,
Jean