Start an open raid. Once you fill up to prevent a lot of people from going afk and just collecting quest change the raid to private. Start kicking out the people that are inactive and not participating.
Warn them then kick them if they dont start to help stomp balloons.
Then yell, Balloon Stomp quest raid looking for X more. Shared stomps. Please send tell for invite. Must be active.
By doing this and everyone stomping you will get one event ticket in less than 10 seconds. It adds up quick.
But you must be able to run to quest giver and turn in quest quickly and continue stomping. To do this set up a macro.
Name: Balloon Stomp
#show (whatever ability)
The most efficient way is to have a raid leader and an assistant. Have one watch inactives and kick while the other yell/invites. You can choose to go public but you wont get tickets as fast because half of them will wait at the quest turn in.
After doing this for about an hour I myself got 240+ event tickets.
Here is a video of my brother and I doing it. I was getting tired since it was 130 am and I had to go to work in a few hours. But you can see when I am not messing up the quest turn in I am getting a event ticket in less than 10 seconds per ticket.
Hope this helps your farming.