Regarding Shavuot:
Deut 16:
10 And thou shalt keep
the feast of weeks unto the LORD thy God with a tribute of a freewill offering of thine hand, which thou shalt give unto the LORD thy God, according as the LORD thy God hath blessed thee: 11 and
thou shalt rejoice before the LORD thy God,
thou, and thy son, and thy daughter, and thy manservant, and thy maidservant, and the Levite that is within thy gates,
and the stranger, and the fatherless, and the widow, that are among you, in the place which the LORD thy God hath chosen to place his name there.
God-fearers in the first century and earler were knoen to have participated in the Feasts of Israel, although slightly differently than Israelites (could not eat of the Passover lamb unless circumcised, etc). This is one of the reasons Paul's gentile converts were almost always first reached by him in the synagogues on Sabbath, because they were keeping Sabbath to one extent or another.
So, actually, it is quite possible there were some strangers in Jerusalem during Pentecost there for the Feast who were NOT in fact proselytes.
In any event, keeping a Feast (or not) by either Jew or Greek doesn't really shed much light on whether or not the Seventy Weeks prevented Gentiles from being saved.
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