There are 9 Quests for the Argin-Hiz Pre-Launch. The Bonus for completing all 9 is a Suffix: , Flame Warder.
Phase 1 Starts from July 4 and Ends September 6. Phase 2 Starts from July 7 and Ends September 6.

There are 6 Quests in the 1st Phase of the Pre-Launch:
Source of the Ash Wind
Sympathy for the Forlorn
No Sympathy for the Forlorn
Sifting Through the Ashes
Fire Prevention
Dousing the Flames

There are 3 Quests for the 2nd Phase of the Pre-Launch:
Topple the Ash Giants
Embers of the Giants
Still the Ash Hurricane