First freestyle competition, 1974 Canadian Open Frisbee Championships, Toronto Canada.

Ken Westerfield and Jim Kenner teamed up with Jeff Otis, event coordinator for the Canadian National Exhibition, to produce the Canadian Open Frisbee Championships. It was at this Tournament that Westerfield and Kenner introduced an event called Freestyle Frisbee and won it

This was the first pairs freestyle competition ever. This event is now a premiere event at disc tournaments world wide
The history of freestyle frisbee events and techniques are covered in the FPA Freestyle Players Association, also in several articles on Wikipedia.
by Freestyle Frisbee February 22, 2012
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Freestyle is a flying disc event where teams of two or three players perform a routine which consists of a series of creative throwing and catching techniques. In competition the routine would be set to music and judged on the basis of difficulty, execution and presentation. The team with the best total score is declared the winner. The first freestyle event occured at the 1974 Canadian Open Frisbee Championships, Toronto, Canada.

Disc freestyle is covered in several Wikipedia articles as well as World Flying Disc Federation (WFDF) and Freestyle Players Association (FPA) history of freestyle.
Frisbee freestyle Canadian Open Frisbee Championships Flying disc Disc freestyle
by Gitis November 2, 2013
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