Get the "Jester's Festival Invitation Scroll" for free from the Crown Shop.
next go in to your Inventory and then Supplies to find and activate it.
This should start the "Jesters Festival" quest.
Jester King Jorunn is found south of Ebonheart in Stonefalls. First you'll have to steal a mudcrab apple from a crate (stealing the apple will put a bounty on your head, so watch out for guards so that they don't confiscate your stolen apple). Then you have to bring the apple to the princess. Then you must lead the princess back to Jorunn.
Jester Queen Ayrenn is in Vulkhel Guard which is the south part of Auridon. You'll have to travel to three different areas and then throw flower petals on two marked people.
Jester King Emeric is found in Daggerfall in Glenumbra. You will have to go to one of two delve towers and farm up the eight needed materials and then go to the other to do the same thing. Once you go back to the Emric so he'll make the dazzlers (which will probably be hard to see if tons of people are crowded around him) and then you'll have to go to different places in the city and use them by pressing
three times in each of the areas.
You can start any one of the three quests but after that you have to do them in a set order. Upon completing the third jesters quest you will be awarded with the title.
This is pretty easy and your level shouldn't matter, should take roughly an hour.