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Originally Posted by Alex Pelan
Just occurred to me...if, in the event that someone does time travel back to this convention, won't they immediately change the future, thus destroying their existence? 
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In some theories. One way to look at it is that all time travelling events ever to happen have already happened, and thusly the future will already have been written accordingly.
Or we could opt for the BttF thoery in which in our dimension, only a discrete number of timejumpers actually game, and in any scenario with other timejumpers will be played out in an alternate dimension (ala BttF II)

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