Tartan Day -- what is it anyway?

Since we are thinking about joining in the Tartan Day march in Adelaide, thought was worth mentioning whats its about

You can read the history of the event at http://en.wikipedia.org/wiki/Tartan_Day

but the key part is as follows :-

"In 1982, under the auspices of the New York Caledonian Club , New York State Governor Hugh Carey, and New York City Mayor Ed Koch declared July 1, 1982, as Tartan Day, a one-time celebration of the 200th anniversary of the Repeal of the Act of Proscription of 12 August 1747, forbidding Scots to wear the Tartan. "

As for why Tartans (and various other items such as bagpipes) were banned --- in essence after the 1745 rebellion (Bonnie Prince Charlie etc) there was a big effort to destroy the Clan System in Scotland. To be honest in most ways this was a positive step, but perhaps things went too far for a while ....

Returning to the point, Tartan Day started off as marking bicentury of when we could wear tartan again, but has since expanded to become an annual event. No real idea when it came to Adelaide, but think I first heard of it about 5 years ago .... does anyone happen to know the real date?

Angus