I just got a RE saying that a Bumbus flying by is summoning me to the Blue Building. Does this actually do anything? I clicked through and went into the blue building but there's nothing new. I tried clicking on the "meet the queen" page but it wouldn't load. Does that random event actually do anything or is it just for fun?

it does normally do something. The Bumbus Queen allows you to turn your Active Pet into a Bumbus.

However, I just went there and got a too many redirects error this page isn't working. Sounds like: it's a bug! ;)

[edit] a little search through Problems & Bugs shows that it has been reported in this thread You should add your information to it.