If, as I have written, some modern rabbis see a connection between Tu B'av, the messiah, and the Song of Solomon then it seems perfectly logical to associate it with the rapture of the bride. Earlier I wrote that when the tribe of Benjamin was allowed to participate in the celebration, the word "harpazo" was used in the scripture. That one word alone should convince us that it is an important holiday to watch for the rapture.
Certainly I will watch the end of July, as it might be the true time for observing Pentecost, but I also have to watch closely the date for Tu B'av. Just as I will watch for the passing of Ariel Sharon. Remember that rabbi Kaduri who died at the age of 108, prophesied that the Messiah would come after Ariel Sharon died. Ariel Sharon is still lingering in a coma. Kaduri said the Messiah would "lift the people". See the video here: http://www.youtube.com/watch?feature=player_detailpage&v=eATJ4PRXEJk
Also note that besides revealing the name of the Messiah in an anagram and the timing of His coming after the passing of Ariel Sharon, rabbi Kaduri also prophesied natural disasters:
"In the future, the Holy One, Blessed be He, will bring about great disasters in the countries of the world to sweeten the judgements of the Land of Israel."
“I am ordering the publication of this declartion as a warning, so that Jews in the countries of the world will be aware of the impending danger and will come to the Land of Israel for the buliding of the Temple and revelation of our righteous Mashiach (Messiah).”
Here is another video about the rabbi's prediction about the Messiah: http://www.youtube.com/watch?v=RBmhkr_TdY8&feature=player_detailpage
Ariel Sharon suffered a stroke in January 2006, about a month before Kaduri died. Now we watch and wait and pray.