The calendar for 15 September 2012 began with the following verses:
Let, we beseech thee, our supplication be accepted before thee, and pray for us unto the Lord, thy God, even for all this remnant, that the Lord, thy God, may show us the way in wherein may walk, and the thing that we may do.
(Jeremiah 42:2 – 3, as rendered by the calendar)

For starters, it actually says this:
Let, we beseech thee, our supplication be accepted before thee, and pray for us unto the Lord thy God, even for all this remnant; (for we are left but a few of many, as thine eyes do behold us:) ³That the Lord thy God may shew us the way wherein we may walk, and the thing that we may do.
(Jeremiah 42:2 – 3)

They skipped the whole section that is in brackets, and didn’t indicate that they did – I thought it was standard practice to use “…” if you’d missed out part of a statement (especially in the middle) when quoting something, but they didn’t do it.

Then they said “show us the way in wherein may walk” which doesn’t even make sense. It actually says “shew us the way wherein we may walk” (which is probably how you read it the first time or two anyway).

Not to mention they used a comma before the section they missed instead of a semicolon, added three commas, and spelt “shew” as “show”.

Then they’re using the wrong verse to support their point. Let’s consider who is asking this, and what they said later on:
Then all the captains of the forces, and Johanan the son of Kareah, and Jezaniah the son of Hoshaiah, and all the people from the least even unto the greatest, came near, ²And said unto Jeremiah the prophet, …
(Jeremiah 42:1 – 2a)

¹And it came to pass, that when Jeremiah had made an end of speaking unto all the people all the words of the Lord their God, for which the Lord their God had sent him to them, even all these words,
²Then spake Azariah the son of Hoshaiah, and Johanan the son of Kareah, and all the proud men, saying unto Jeremiah, Thou speakest falsely: the Lord our God hath not sent thee to say, Go not into Egypt to sojourn there:
³But Baruch the son of Neriah setteth thee on against us, for to deliver us into the hand of the Chaldeans, that they might put us to death, and carry us away captives into Babylon.
⁴So Johanan the son of Kareah, and all the captains of the forces, and all the people, obeyed not the voice of the Lord, to dwell in the land of Judah.
⁵But Johanan the son of Kareah, and all the captains of the forces, took all the remnant of Judah, that were returned from all nations, whither they had been driven, to dwell in the land of Judah;
⁶Even men, and women, and children, and the king’s daughters, and every person that Nebuzaradan the captain of the guard had left with Gedaliah the son of Ahikam the son of Shaphan, and Jeremiah the prophet, and Baruch the son of Neriah.
⁷So they came into the land of Egypt: for they obeyed not the voice of the Lord: thus came they even to Tahpanhes.
(Jeremiah 43:1 – 7)

Let us also consider the following that Jeremiah told the people:
¹⁹The Lord hath said concerning you, O ye remnant of Judah; Go ye not into Egypt: know certainly that I have admonished you this day.
²⁰For ye dissembled in your hearts, when ye sent me unto the Lord your God, saying, Pray for us unto the Lord our God; and according unto all that the Lord our God shall say, so declare unto us, and we will do it.
²¹And now I have this day declared it to you; but ye have not obeyed the voice of the Lord your God, nor any thing for the which he hath sent me unto you.
²²Now therefore know certainly that ye shall die by the sword, by the famine, and by the pestilence, in the place whither ye desire to go and to sojourn.
(Jeremiah 42:19 – 22)

He told them this before they had answered a word, and put it in past tense too. How did Jeremiah know? Simply, God must have told him. Why does this matter? Because of the second word in the first sentence of the message on the calendar:
“A faithful remnant of the Jews approached Jeremiah asking that he pray for them so that they might walk a pathway pleasing to God.”

They were most definitely not “a faithful remnant”! This may not take away from the message in any way; however it definitely does not support it. The message is good, but it doesn’t give its own basis. A better verse would have been one of these:
Psalms 5:8 Lead me, O LORD, in thy righteousness because of mine enemies; make thy way straight before my face
17:5 Hold up my goings in thy paths, that my footsteps slip not
25:4 Shew me thy ways, O LORD; teach me thy paths
27:11 Teach me thy way, O LORD, and lead me in a plain path
119:27 Make me to understand the way of they precepts
139:24 Lead me in the way everlasting