/asjufhs/dgiu
You people.
otto was looking for when the blockland is started. Like double click the icon, game pops up. (I fink.)
Yeah, do what DrenDran said
he closest thing you have is simply writing down what ever you want to happen outside of any function, it will be executed as soon as the add-on is executed, which is as close as you can get.
As for a clientside function for when you join a server, I'd try either parenting whatever function is called when you click the join server button, or LoadingGui::onWake, though that would cause issues if you manually change to it for some reason. Though there's probably some other function that I can't think of.