Ok, so you want to have all trinkets und both mounts but only kill the boss 5 times (if everybody got the quest to start the event)
Search for a Tank, Heal, Warlock and a random Damagedealer (best is if there full epic)
Go all over to Brd.
type in /who shattrath 70
Write to about 5 people something like this: Hi, do you want to join us kill the BRD eventboss? Takes only 5 minutes, good loot and very easy.
About 2 of the 5 will say yes, invite them, Warlock port, kill the boss, kick after looting. and invite another one.
We farmed the boss about 100 times with the random people (about 7 mins per bosskill and new invite)
Hope that helped you farming your mounts!
Sorry for bad english
(trying to get out of leecher)