Can I play the season 1 content ?
Not at this time.
It is possible that it will be added to the Journal in the future, but right now it is not available.
Krall Bloodsword – Mesmer
Krall Peterson – Warrior
Piken Square
Krall Peterson – Warrior
Piken Square
Welcome!
Anyway you can refer to the red post here: https://forum-en.gw2archive.eu/forum/game/gw2/Living-World-S1-coming-to-the-journal