"An assassination has created a vacancy on the Captain’s Council of Lion’s Arch. Two candidates —war hero Ellen Kiel and prominent merchant Evon Gnashblade —both want to occupy that empty seat, but they can’t do it without your support!
To prove they have what it takes to sit on the powerful ruling council, Kiel and Gnashblade will compete to secure a lucrative trade agreement with the merchants of the Zephyr Sanctum. Support your favorite candidate as you experience two weeks of new events, activities, features and rewards beginning July 23!" -- GW2 wiki
Come join TG in an event that will take us through some of the new content and achievements for the newest patch! We will focus on completing the new achievements and (if we have time) the new activities for PvE and PvP (Candidate Trials or Southsun Survival and Aspect Arena)!
Candidate Trials is basically a "defend this spot from waves of pirates" type thing. It sounds like this is where you can get a ton of support tokens that will help with the achievements.
Southsun Survival is basically the hunger games. You are put in an arena and can only use the weapons/traps/ammo you find to kill the other competitors. The last one standing wins. (there is even a debuff called Hunger...)
Aspect Arena is like a battle royale where you will use one of the aspects for skills. It's a pvp type match that lasts 5 minutes where you respawn if you get defeated, and the team with the highest score wins.