its a special event that allows you to get codes for special Pokemon and some times play the news Pokemon games that are to be released soon. they are quite rare and to get on in your town would be about once a year.
like i said, it's random where they're going to show up next. My advice, look it up on Google or something, as i have little knowledge of Nintendo events, nor have i ever been to one.
Edit: if you have any more questions, pm me, as this topic has serve it's purpose now and should be locked.
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