By eHow Holidays & Celebrations Editor
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On June 24, 1947, Idaho pilot Ken Arnold spotted a group of unidentified flying objects over Mt. Rainier, Wash., sparking worldwide speculation of government cover-ups and fear of extraterrestrial invasion. To mark the occasion of this first reported UFO sighting, June 24 is known as World UFO Day. Here's what to do if you want to throw your own UFO party.
eHow Holidays & Celebrations Editor