A very quick, rough timeline of the explicit deal-making part could look something like this:
~
1997 or so (?): GREC starts trying to formulate plans for 'reconciling' the SSPX & NewRome
late 1990s - Bishop Fellay starts planning the Jubilee Pilgrimage to Rome
spring 2000: NewRome starts making overtures to the SSPX to 'reconcile'
- “Inside the Vatican” article entitled “Rome’s new ‘Game Plan’: Heal the Lefebvre schism”
- Cardinal Castrillón Hoyos invites 4 SSPX bishops to lunch
August 2000: SSPX Pilgrimage to Rome, which provides an excuse for restarting "discussions" with NewRome.
- Three SSPX bishops have lunch with Cardinal Castrillón Hoyos after the pilgrimage. +W tells Cardinal Castrillón "they're 2 different religions."
(From this point on, there are various priests resisting the deal-making, but not much in a very public way for a while; you could add details here about transfers of priests, etc. but I'm typing this off the cuff. Likewise +F's
30 Days interview where he says if Rome asks him to come he'd say
I run, and the "accept 95% of the Council" and also another recent interview that just came to light from 2001 or so - as I said, tons of details, some of which were not widely known at the time)
early-July 2006: General Chapter of SSPX
- Chapter reaffirms the 1974 Declaration "we refuse, and we have always refused, to follow the Rome of neo-modernist and neo-Protestant tendencies..." &
- Bishop Fellay is re-elected
late July 2006: Bishop Fellay announced his plan for a “Crusade of the Rosary” to “obtain from Heaven for Pope Benedict XVI the strength required to completely free up the Mass of all time, called the Tridentine Mass.”
It was the stated purpose for the “freeing of the traditional Mass.”
July 2007: Motu Proprio Summorum Pontificuм which says, “This Mass of Paul VI obviously is and continues to be the normal form, the ordinary form of the Eucharistic Liturgy." ...“It is not appropriate to speak of these two versions of the Roman Missal as if they were “two Rites.” Rather, it is a matter of a twofold use of the one and the same rite.” “The new Missal will certainly remain the form of the Roman Rite not only on account of the juridical norm but also because of the actual situation of the communities of the faithful.” and “There is no contradiction between the two editions of the Roman Missal.”
2007: Bishop Fellay is quoted as saying:
...we could hardly re-enter a Church as is. And the reasons are quite simple. Benedict XVI has indeed liberalized the ancient rite, but I cannot explain for what reason he made such a decision if he then allows the majority of Bishops to criticize and disobey him regarding what he determined. What should we do? Re-enter the Church and then be insulted by all those people?"
October, 2008: new Crusade of the Rosary
... Regarding developments in the ongoing conversation between the leadership of the Fraternity and Cardinal Castrillón Hoyos, President of the Pontifical Commission "Ecclesia Dei", the SSPX will start this Saturday a "Crusade of the Rosary" to "obtain from Our Lady the removal of the Decree of Excommunication", a "crusade" which will last from November 1 to Christmas Day.
Jan. 2009 - BXVI "lifts" the non-existent "excommunications" from the 4 living SSPX bishops
2009: +F starts saying things like "The Jєωs are 'our elder brothers' in the sense that we have something in common, that is, the old Covenant."
late 2009 to some time in 2011? - SSPX formal but secret doctrinal talks with Rome
Dec. 2010: Bishop Fellay is quoted as saying:
...the Pope says that there is solely a problem of a canonical nature. An act of Rome suffices to state that it's over and that we reenter the Church. This will happen. I am very optimistic.
August 2011: +F describes result of doctrinal talks: " there is a clash of mentalities… In any case, we are certainly not in agreement.
If there is one thing we agree on, that is that we do not agree on anything.”
September 2011: Cardinal Levada gives +F a secret docuмent called a "Doctrinal Preamble" and another secret docuмent which would be the terms of the agreement
Oct. 2011: Albano meeting of (more or less) the General Chapter of the SSPX to discuss the deal proposed by Cardinal Levada;
- Bishop Williamson is banned from his rightful attendance at this meeting
- Doctrinal Preamble is read to priests, but they are not given a copy
1 Nov. 2011:
British District Newletter online states:
- "...the stated consensus of those in attendance was that
the Doctrinal Preamble was clearly unacceptable and that
the time has certainly not come to pursue any practical agreement as long as the doctrinal issues remain outstanding. It also agreed that the Society should continue its work of insisting upon the doctrinal questions in any contacts with the Roman authorities."
2 Nov. 2011: British District Newletter removed from internet; Menzingen slaps the wrist by stating that no one is allowed to reveal anything except Menzingen
- (plus around this same time there was a headline to the effect that +F said "we did not reject the preamble", but I can't find the reference at the moment)
fall 2011: Several meetings are held in Europe for the purpose of trying to sell the deal to SSPX priests
March 16, 2012: Cardinal Levada meets Bishop Fellay, and gives him a letter, and +L says this letter has been approved by the Pope. This letter says: "You do not have the right to oppose what the Church has taught yesterday with what she's teaching today. You cannot say there are errors in the Council. ... If you refuse the proposal of the 14th September, which has been explicitly approved by the Pope, this means that in the facts you reject the authority of the Pope." +L essentially demands that +F sign the Doctrinal Preamble submitted to the Society in September 2011
March 2012:
Cor Unum (internal SSPX newsletter - I don't have time to read it now, but I get the impression this Cor Unum started to alarm the priests that there was an imminent deal with Rome; anyone more familiar can comment on this)
7 April 2012:
Letter from Three Bishops to the SSPX General Council14 April 2012:
Letter of Reply to Three Bishops from the SSPX General Council15 April 2012 (100 year anniversary of Titanic sinking):
Bishop Fellay's Doctrinal Declaration Presented to NewRomeMay 11, 2012: +F interview with CNS goes public, in which he says things such as "religious liberty of the council is very very limited"
Pentecost, 2012: Frs. Joseph Pfeiffer and Chazal give sermons which go viral
And that's as far as I have time for right now. Hopefully it gives a sort of general starting point, and others can flesh out the details and/or add (and correct; as I said this was done off the cuff)