I've stepped up to run one of the local Encounters tables for this season. However I don't have adventure chapters 1 & 2. What has happened in the story up until now?
Not a whole lot, really.
Those are the high points that I remember from being a player. I'm probably missing a hook or two.
There many great blogs on people detailing their groups adventures. Try obsidian portal. Also a quick Google search got me this:
LINK TO SPOILERS
which is a pretty clean summary. Happy DM'ing