"Random Event 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! "

Is this just a suggestion or am I being summoned for a specific reason? And I just noticed that the Blue Building has quests now, are they worth it? Sorry I've been gone for quite a while

The random event grants you access to the Bumbus Queen. This will allow you (only if you want) to change one of your existing pets into a bumbus. (As opposed to the "adopt a bumbus" option, where you can create an extra bumbus pet.)

The quests have been there as long as I can remember. They up your ranking and give you points, which you can spend in the Blue Building shop. (The higher your ranking, the more items become visible that you can buy.)