TL;DR Chronological log of what’s happened in the adventure. Every session you can write up what happened for extra XP.
Every campaign gets an Adventure Log, a blog for your adventures!
While the wiki is great for organizing your campaign world, it’s not the best way to chronicle your adventures. For that purpose, you need a blog!
The Adventure Log will allow you to chronologically order the happenings of your campaign. It serves as the record of what has passed. After each gaming session, come to the Adventure Log and write up what happened. In time, it will grow into a great story!
Best of all, each Adventure Log post is also a wiki page! You can link back and forth with your wiki, characters, and so forth as you wish.
Each after-session log will be worth 100 extra xp if done before the next session. If you first post a “Story so far” they will be worth 150 each. Remember these are written from the point of view of your character, so try to keep it in character and omit “player knowledge.” Happy writing.