The micro-holiday takes you back to Borean Tundra's Winterfin Retreat. It will be live on April 5.
Murlocs have been a symbol of World of Warcraft since the game's beginning. During the micro-holiday, you can adopt any murloc and complete quests with him. When you arrive at Winterfin Retreat, you'll notice plenty of murlocs running around like crazy.
Talk to King Mrgl-Mrgl and pick up the quest Adopt a Tadpole.
Afterwards, go and talk to any murloc you wish to adopt, there are many, I picked Flops.
Complete the quest and your tadpole will give you another quest, where you must collect 10 Winterfin ClamWinterfin Clams (most of them can be found in the water). The quest is called "A Tadpole's Request".
Next you will accept the quest "The Ways of the World". The objective is to kill Mrrga. The mob's Health is scaled to Level 110, the murlocs in the water where you collect clams are only 70+.
After you slay the beast, there's a final quest called "A Gift From Your Tadpole". It's a blue (daily?) quest and you receive a Tadpole Gift with various trash items! I received a Wet Rock.
That's it for the March of the Tadpoles micro-holiday.