Two quests from the sphinx are only offered on April 1st.
Today is April Fools Day, marking the Highest of Silly Days for the Bristlebane Day celebration. Two quests are only available on this day, both given by the sphinx Imenand in Enchanted Lands. Test your brain by trying to solve his many riddles and take a gamble at your choice of rewards.
Players can also harvest from the Jester's Superior Gardens on this day, which can be found in Enchanted Lands only. These gardens give harvests from every holiday event that has crafting, so be sure you have a lot of spare backpack space! Those wanting to sneak in some mid-year Frostfell crafting can do so as well. Check the Marketplace for some Bristlebane Day promotional items which include a glider mount and a jester's costume.
The Highest of Silly Days runs until 11:59pm PDT on April 1st.