The 50th & 51st Verses of the Double-Perasha
Rav Fish, quoting R' Y.M. Morgenshtern Shlit"a, about Nitzavim/Yayeilech:
And these  Parshiyot have 70 verses, and when we make a calculation and divide the aforementioned 70 verses into these 100 years, it comes out that every verse corresponds to 70% of a year, which is a bit more than two thirds of a year [YY - I think he meant to say that every year corresponds to 70% of a verse, which is a bit more than two thirds of a verse - not the other way around]. We see from here that the year 5771 is in the 50th verse: וַיְצַו מֹשֶׁה, אוֹתָם לֵאמֹר: מִקֵּץ שֶׁבַע שָׁנִים, בְּמֹעֵד שְׁנַת הַשְּׁמִטָּה--בְּחַג הַסֻּכּוֹת [And Moses commanded them, saying: 'At the end of every seven years, in the set time of the year of release, in the feast of tabernacles], and see there that Moshe Rabbeinu commanded them about the Mitzva of Hak'hel in the year after Shemitta. And it's known what Haza"l say that in the year after the seventh, Mashiah Ben David comes. Since this is the year that is coming upon us for good, despite the fact that according to the Shemitta cycle, this is not the year after Shemitta, nevertheless, according to the spiritual lights that are drawn from above, this year is considered like the year after the seventh.
We get to the 50th verse because 0.71x70=49.7 (where 0.71 corresponds to the year of our century and 70 refers to the 70 verses in Nitzavim/Vayeilech).
In the upcoming year, we get to the 51st verse:
when all Israel is come to appear before the LORD thy God in the place which He shall choose, thou shalt read this law before all Israel in their hearing.
This is because 0.72x70=50.4, which is into the number 51.
I would like to focus on some other interesting aspects of the 50th and 51st verses.
1) The word מקץ. I remember reading in a sefer, but I don't remember where, that the word מקץ is mentioned 9 times in the Torah. Each time, it refers to a monumental point in time - a Ketz. I don't remember what the sefer said, so the following reasons for each verse are my own (let me know if you can find better reasons, as these were thought up quickly):
- Bereishit 4:3 - First case of conflict in the world
- Bereishit 8:6 - Beginning of new world after the flood
- Bereishit 16:3 - Beginning of Yishmael in the world
- Bereishit 41:1 - First case of individual redemption in the world
- Shemot 12:41 - First case of national redemption in the world
- Bemidbar 13:25 - First case of national mourning in the world
- Devarim 9:11 - Beginning of Torah in the world
- Devarim 15:1 - Beginning of acknowledging that all money belongs to Hashem?
- Devarim 31:10 - Beginning of all Jews - men, women, and children - united in the Beit Hamikdash
3) בְּבוֹא כָל-יִשְׂרָאֵל, לֵרָאוֹת אֶת-פְּנֵי יְהוָה אֱלֹהֶיךָ, בַּמָּקוֹם, אֲשֶׁר יִבְחָר besides the simple meaning of being Oleh Regel for Hak'hel, has another connotation of Kibbutz Galuyot.