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We have a tradition that Tisha B'Av will become a holiday in the time of Moshiach. Will that holiday also be nidcheh if it comes out on Shabbos?

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+1 great question! –  Charles Koppelman Jul 23 '12 at 18:14
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When do you see a yom tov pushed off? –  sam Jul 23 '12 at 18:15
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@sam Maybe Purim Meshulash? –  Double AA Jul 23 '12 at 18:18
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Note that at that time we will probably be setting the calendar based on witnesses so any of the 4 fasts/holidays could fall on Shabbat. –  Double AA Jul 23 '12 at 18:19
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I think the underlying question is what the nature of the yom tov will be -- will it be like pesach which is not pushed off and is a full yom tov, or like purim (shushan purim in a walled city) which is pushed off and is only a "holiday" not a yom tov. each commemorates a victory over evil, but only pesach is a celebration of a real ge'ulah, much like Tish'a b'av will be. so my vote is full yom tov and not pushed off. –  Danno Jul 23 '12 at 22:04
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The Gemara in Megillah 5a says that the reason we push off Tishah be-Av is because אקדומי פורענות לא מקדמי. In other words, since you cannot fast on Shabbos, Tishah be-av must be changed, and since it is a sad time, we push it off instead of moving it forward. Since this reason will not apply in the days of mashiach, there will be no reason to push it off.

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No, that's the reason to push it forward instead of backward, not why it can't be on Shabbat. –  Double AA Mar 13 '13 at 22:37
    
Also, how do you know there aren't other reasons that may come into play then, which are not in play now? –  Double AA Mar 13 '13 at 22:38
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Wouldn't that render any question about the future meaningless? How do you know anything about halakhah if not based on the sources that exist, in the current world? –  wfb Mar 13 '13 at 23:37
    
It would not because perhaps there are other sources which you may have overlooked which discuss the future explicitly. –  Double AA Apr 8 '13 at 1:26
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No one knows yet, but there will be no reason to postpone it since the only reason to postpone is that mourning is not allowed on Shabbat.

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Purim is a positive holiday which is pushed off from Shabbat! –  Double AA Mar 13 '13 at 12:58
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BS"D

Baised off of already set Halakha ( inlight of the fact that most likely when fast days become Yom Ttov's there will be a reinstated Sanhedrin who could change existing Halakha) The answer is simply no.

From what we know of about the 9th of av changing: "Thus saith the HaShem of hosts: The fast of the fourth month, and the fast of the fifth, and the fast of the seventh, and the fast of the tenth, shall be to the house of Judah joy and gladness, and cheerful seasons"-Zekharyah 8:19

Not giving any depths or details what these new joyful days actually are and still staying in the parameters of the currently established Halakhic system its safe to say that they like other Holidays would not get pushed off. As far as Halakhic sources as to why any Yom Ttov would be postponed, I know of none. This is all stating that the fast days become full Yom Ttov's and not remembrance days such as Purim or Hhanukah.

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