"A group of bumbii buzzes your way. One of them drops a small note into your hands summoning you to the Blue Building! Who or what could be waiting on your arrival? Quick, don't be late!"

Does this mean anything? Nothing happens when I go to the Blue Building.

That random event gives you a quest from the Bumbus Queen to turn one of your existing pets into a Bumbus. If you go to Floor 7, that's where it is.

I didn't know that. Thanks!

- From what I remember, completing the Queen's request will grant you the option of changing one of your pets into a bumbi.