HS anniversary??

[ShayBells]

Went on easyWDW to look at crowd numbers and it says HS anniversary on May 1st and it says "various celebrations." Does anyone know where I can find out exactly what is going on or can anyone just tell me? Also do you know if they'll have shirts lol and if they will be on sale all week or just that day. I have a disney world 25th anniversary shirt that I wear all the time and it'd be cool too add a special HS one

Thanks.

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[WEDWDW]

The only thing known so far is a 25th Anniversary fireworks show at 9:30.