More Party Members : GW Submissions

Go to an outpost with a large party limit, like Temple of the Ages. Form a full party, then run to another town or mission. Even if the party limit is lower there, your party will stay together, giving you a larger team than you should have.
The best use for this is to form a party at Temple of the Ages, then run to Sanctum Cay to do that mission with eight people instead of six. The other good use for this trick is for the Althea's Ashes quest. Form your party in Yak's Bend, then travel back to Ascalon and the Charr Flame Temple. This lets you complete that area with six players instead of four.

well known, sorry.