Please actually read the quest books and pay attention to what the NPCs tell you. This quest isn't self-explanatory or all that linear. Taking a few moments to actually read what the quest book says will prevent you having to spam world chat asking for help for information that is already available to you. I went to the trouble of making it easy for you, the least you can do is read it.

There are 60 total rewards, which are on display on the rooftop next to the reward NPC. The vines that are on display come in both directions for each of the 6 colors, I just didn't have room to display them all.
This quest can be repeated every 8 hours and will be open until approximately May 1st. The quest books will decay 24 hours after you obtain them.
Any attempt to obtain multiple quest books in order to run the quest more frequently, and any attempts to obtain multiple rewards for an individual quest run will result in revocation of access to the quest. Being a poor sport, causing trouble, or otherwise just being a stick in the mud in regards to the event may also result in revocation of access to it. Basically, play nice and you'll be fine.
Enjoy, shardlings!
+N