I most definitely DO think the Rapture will occur on a Feast of Trumpets, as do most Messianic Jews (I am a Gentile)!  For some REALLY interesting facts, please read the following article on my website (entitled "Feast of Trumpets & the Rapture"):
 
http://www.bibleprophesy.org/introtrumpets.htm
 
It explains the phrase "Of that day or hour no man knows", among many other things!
 
Another excellent article I have posted is called "No Man Knows the Day or the Hour" by Hativka Ministries:
 
http://www.hatikva.org/articles/no-man-knows-the-day.htm
 
Another excellent article on the Rapture is called "Jewish Wedding Traditions & the Rapture", found here:
 
http://www.his-forever.com/jewish_weddings_rapture.htm
 
I don't necessarily think it will happen on man's set day for FOT, however, because God's set time for it may be totally different than man's set time for it ("it" being the feast itself), so if it doesn't necessarily happen on THE days we have set, don't lose heart.  You are SO right... Christ is coming REALLY soon!!!  See ya in the clouds of glory!
 
YSIC!
Peg
www.his-forever.com