Handy Guide here (borrowed from the Official forums)
Rakghoul World Event
So currently at the minute there is a world event that just started in swtor involving Tatooine and Rakghouls. There are a bunch of dailies that start in the Dune Sea and continue to the southeastern portion of Tatooine and we will see where else they go after that. So far it seems like the main reward is Orange gear that looks pretty and other things but I am sure there is much more. I will post a guide on all this stuff later but right now I am still working on figuring things out (Torhead doesn't even have any updates yet).
It appears that the main currency for these dailies is Rakghoul DNA Samples. It says on the item "This Rakghoul DNa sample would probably be valuable on the open market, if you can find a buyer somewhere on Tatooine." So far I have heard the vendor is in Anchorhead but I can't confirm as I am still working on the Outbreak daily which had me collect Infected Wrappings, find the escape pod and now recover Samples from Infected Livestock. I'll do a more indepth guide sometime later once I know more!
Rakghoul DNA Samples Questions
"Where is the vendor for Rakghoul DNA Samples?" - I have been seeing this question asked non stop in /1. The vendor is located north of the Republic town in the Dune Sea, turn on the vendor symbol on your map and you will find him easily. He sells a Rakghoul pet and a bunch of Black-Green crystals. A pretty mediocre reward if you ask me.
"Where do the Dailies start for the Rakghoul World Event on Tatooine?" - The dailies start in the Dune Sea. For Republic it is northeast of their town. Imperials use the same vendor that the Republic players do. You don't actually pick up the quest from anyone for the dailies it is an [AREA] quest. All you have to do is walk into the area to start them.
"What level do I have to be to get the dailies for the Rakghoul World Event?" - You must be at least around the level range of Tatooine (20 - 25; in that range) in order to start the daily to the best of my knowledge. You can group up to speed up the process while doing the daily too.
"What does the vendor sell that accepts the Rakghoul DNA Samples?" - The vendor sells a mini Rakghoul pet, Black-Green Lightsaber Crystals and a box that contains a random Companion Customization.
"How long will this "event" be around for?" - Currently we don't know, it just started today though so hop in whenever, it's loads of fun!
"None of the items from the Rakghoul DNA Samples interest me, what should I do with them?" - You can sell them to other players for Credits if you don't want anything from the vendor. Depending on your server 10k per Rakghoul DNA Sample will probably be a good price.
"Do Imperials have dailies in the same places the Republic players do? Right above the Republic town where it is marked on your map below?" - As far as I know they do! I am not 100% certain if it is the same in the Dune Sea but in the southeastern end of Tatooine Republic and Imperial players do mingle together. As they're working on these dailies.
"How many Rakghoul DNA Samples can you get in a day from the dailies?" - You can get 11 in total from doing all of the dailies.
"Is there any other way to get Rakghoul DNA Samples aside from the dailies?" - Getting infected and "exploding" and infecting other players around you will reward you with more Rakghoul DNA samples. You can do this as many times as you want a day. In order to get infected fight the Rakghouls in the daily area or have another player explode by you and infect you. (Stand around on fleet long enough this is bound to happen)
"How do I get the Infect other players daily?" - In order to get this daily quest you must first become Lightheaded and wait awhile to then become Feverish. Once you are Feverish you will have to wait another little bit of time (usually 5 to 10 minutes) at which point you will explode and infect everyone around you that is not already infected. If you infect someone else you will start the Plaguebearer quest.
"How do I get infected to start the daily mission?" - You can get infected from another player exploding or by being attacked by the Rakghouls or other infected mobs on Tatooine.
"How long does it take you to explode once you're infected for the daily?" - First you become Lightheaded and that lasts for about 5 minutes or so and then you become Feverish which lasts for another 5 to 10 minutes and then you finally explode and infect everyone around you which will either start the daily "Plaguebearer" or update it if you already have it.
The vendor that accepts the Rakghoul DNA is named Jeelvic. Below is a picture of him, his location on the map and a list of all his loot.
<The bottom bit here you'll have to go to my website for as I can't post pictures in this post, I will work on adding a text version of it soon though!>
Location of Dailies and Rakghoul DNA Vendor
http://almarsguides.com/swtor/flashpoints/rakghoulworldevent.cfm