Nothing happened, because humans made the circle, and unless -they- conduct some form of a event in regards to the circle they made... nothing is
going to continue to happen.
Why would any intelligent species come all this way to our planet to help us.. to warn us of impending events (which are all doomsday scenarios of
course), and they leave them in CROPS?
I firmly believe in UFOs (a small % of them), being something we can't explain. It's not terrestrial.. it's not ours. I believe that crop circles
are made by circle making groups who just happen to love making these conspiracy-laden designs, that they KNOW you will spend countless hours trying
to decipher them. There is no meaning.. but they know that the same folks who can take any random group of numbers (like say.. 1,821), and turn it
into a doom-laden conspiracy theory, will take their design and create all sorts of amazing predictions.
If an intelligent race wanted to assist us, they'd SEND US AN EMAIL! Literally. Or direct messages to all governments on the planet, or something
along those lines. They would not carve messages crucial to our survival in crops, often all within driving distance of small towns, often in the
same country. It's ludicrous to think they would even do that.
I'll be patient and "wait" for the next event to come to pass. Perhaps after the 29th incorrect translations (oops.. we got it wrong again!),
people will realize they mean.. nothing at all.