Pentecost is definitely the rapture feast.  It is a feast of a double-nature (opened the church age and will close it.) It is the wheat harvest feast and has not taken her harvest yet, which is the wise virgins of the church age.
 
I see so much confusion over this subject and there should not be.  One only need know some of the laws surrounding each feast which I very briefly will cover. Those laws are prophesying what will happen to fulfill each particular feast day.
 
1. All the feasts, Sabbaths and new moons had trumpets or the shofar blown.
 
2. The Jews did not fulfill any of them.  Jesus and the Holy Ghost were the ones who did the fulfilling.  Jesus was crucified on Passover, went down and preached to those in paradise on Unleavened Bread, and arose on First Fruits (Barley Harvest feast), after him those many saints he preached to arose also, see 1 Pet. 3:18-23 and Matt. 27:52-53.  Fifty days after First Fruits he sent the Holy Ghost on Pentecost, Lev 23:15-17 and Acts 2.
 
3. We do not count Pentecost from Passover, it is counted fifty days from First Fruits, the Barley Harvest Feast.  Both  harvest feasts will always fall on Sunday, the first day of God's week.  The Barley Harvest Feast is the first Sunday AFTER Passover, and Pentecost is exactly 50 days after First Fruits on another Sunday.  Even though it is placed during the week on most Jewish calendars, this is incorrect.  Lev. 23:10-14 tells us to start counting "on the morrow after the Sabbath."  He is speaking here of the His weekly Sabbath which is on Saturday.
God placed these two harvest feasts after the weekly Sabbath on the first day of the week which is a work day. It is unlawful for them to work /harvest on any Sabbath.  See the prophecy and symbolism?
 
4. Pentecost is the wheat harvest feast.  We who are counted as wise virgins of the church age will be harvested on this feast whether we are dead or alive.  Rosh Hashanah is for the return of Jesus and the uncountable millions who are be in heaven at that point, which is at the end oaf the tribulation period.
 
Num. 10:1-13 And the Lord spake unto Moses, saying, Make thee two trumpets of silver; of a whole piece shalt thou make them: that thou mayest use them for the calling of the assembly, and for the journeying of the camps. And when they shall blow with them, all the assembly shall assemble themselves to thee at the door of the tabernacle of the congregation.
 
The silver trumpets symbolize the spiritual and is for calling the church (elders/wise virgins)  up to him in the sky to take us to that heavenly tabernacle where we will be in a place of safety  BEFORE  the seven years of tribulation. The rams horn blown at Rosh Hashanah symbolizes the physical and is used for calling the twelve tribes (elect) back to Israel when Jesus returns FROM heaven with all the heavenly saints  AT THE END  of the tribulation to reign for 1000 years on this earth with him.
 
Every move God had the priests doing on these feast days were prophecies, foretelling the fulfillment.  So we need to look at what those priests were doing on Pentecost.   In the first watch (evening) they cleansed the great alter where the offerings would be examined.  Jesus is our High Priest and we are his offerings.  This is where we will know if what we have done will be hay, stubble, gold or silver.  Our rewards will depend on this.  At midnight the temple doors are thrown open to receive the congregation in that heavenly tabernacle.  The two loaves represent the church under the law and the church under grace.
 
There is a surprise  awaiting many Christians.  Much of the church is living a carnal life and thinks anything is acceptable because we are Christian, we know Jesus.  Sin is not preached much anymore, nor is repentance. What happens to the carnal Christian?  Is he saved?  Yes!  But he will not be an elder/wise virgin who will sit on a throne, wear a crown, and co-rule with Jesus.  Only the wise Christian will be caught up with Jesus at the rapture.
 
The unwise carnal Christian must await their  turn to be caught up about mid-trib, see rev. 7:9-13. These have washed their robes....they had robes, they had cleaned them up. The unwise of Matthew 25 are all virgins looking for a bridegroom but many needed to repent (clean their robes) but they waited too late to do that and did not go at the appointed time. They are unwise believers, carnal Christians.
 
Matt. 25: 6-10  And at midnight there was a cry made, Behold, the bridegroom cometh; go ye out to meet him. Then all those virgins arose and trimmed their lamps, And the foolish said unto the wise, give us of your oil; for our lamps are gone out. But the wise answered, saying, Not so; lest there be not enough for us and you: but go ye rather to them that sell, and buy for yourselves.  And while they went to buy, the bridegroom came; and they that were ready went in with him to the marriage: and the door was shut. (We saw a symbolization of this in Noah's day when the door of the ark was shut to Noah's congregation.)
 
Putting all this in context:  By the time the cry went forth, it was already too late for the unwise.  When did the cut-off time happen for the unwise? Passover of that year is the cut-off time.  So if 2005 is the year of our rapture,  Passover will be on Nisan 14th on the Jewish civil calendar, and  April 15 on our Gregorian calendar.   The midnight cry will go forth sometime in-between Passover and Pentecost.  Probably three days before Pentecost.  They knew who was going and who was not.......awesome!  Do the scriptures lie?
 
How do we know Passover is the cut-off time?  There again what were the laws surrounding this feast which are prophecies of its fulfillments? The proper lineup in the cycle shows that the year of these particular fulfillments will be preceding a Sabbath year.  The law states they must  STOP ALL SOWING  in the fields so there will be no harvesting after Pentecost.  Before Pentecost  they  can only harvest  what had already been planted; the barley and the wheat.  As we know the barley harvest has taken place but the wheat harvest has not.
 
You cannot get all this information from mathematics, which is confusing, and so far has never been accurate.
 
God bless,
 
Webster