History
 June 14   1924   Birthday of Mother Petra
 June 1   1969   Foundation Day
 June 29     Feast day of Mother Petra
 September 29   1970   Approval of the first Constitution
 May 3   1971   Blessing of the Mother House at Pattuvam
 January 1   1972   First profession of the first members
 June 5   1976   Mother Petra Born to Heaven
 June 1-4   1983   I General Chapter
 September 21   1983   Congregation raised to Diocesan Status
 Oct 31   1987   Mission started in Germany
 June 29 –July 2   1989   II General Chapter
 April 27   1991   Opening of the Novitiate at Bangalore
  1993 – 1994   Silver Jubilee of the Congregation 
 Dec 24   1994   Mission started in Italy
 May 30 - 31   1995   III General Chapter
 June 1   1999   Official Declaration of the Congregation into three Regions
 June 15   1999   Erection of the Vimala Region
 June 18   1999   Erection of the Nirmala Region
 June 23   1999   Erection of Amala Region
 Dece. 28–31   1999   1st Regional Assembly of Vimala Region
 Jan.1–2   2000   1st Regional Assembly of Nirmala Region
 Jan. 25–27   2000   1st Regional Assembly of Amala Region
 February 21   2000   Death of Sr. Holda, the then Superior General
 Oct 23-28   2000   IV General Chapter
 June 1   2001   Promulgation of the Revised Constitution & Directory
 June 5   2001   25th Death Anniversary of Mother Petra
 March 1   2001   General Administration shifted to separate building
 April 26   2001   Erection of the Unit House (M.P, U.P & Jarkhand)
 Jan 11   2003   Blessing and Inauguration of the Prayer House at Poomala
 February 2   2003   Dinasevanasabha raised to the Pontifical Status
 December 8   2004  Blessing of the New Ashram Chapel
 Sept. 27–Oct. 8   2006  V General Chapter
    2007  Dinasevanasabha has added to the Merician Family
 March 19   2007   Revised Constitution & Directory Approved by Rome
 April 29–May 5   2007   Regional Assembly of Amal Jyothi Vice- Province
 May 7–12   2007   Regional Assembly of Vimala Province
 May 12–18   2007   Regional Assembly of Nirmala Province
 May 18–25   2007   Regional Assembly of Amala Province
 June 1   2007  Declaration & Erection of DSS into three provinces & One Vice Province
 Aug 25   2007   Award given to Mother Willigard
 June 14   2009  Declaration of Mother Petra Dinadasi as Servant of God by Rt. Rev. Dr. Varghese Chakkalakal,     the then Bishop of the Diocese of Kannur.
 May 6   2010  Death of Mother Willigard, the Second Superior General
 May 11–18   2010   1st Provincial Chapter of Vimala Province
 May 19–27   2010   1st Provincial Chapter of Amala Province
 May 5–6 & June 6–13   2010   1st Provincial Chapter of Nirmala Province
 May 5–6 &July 12–17   2010   1st Provincial Chapter of Amal Jyothi Vice-Province
 Sep 21   2010  Blessing and Inauguration of the Newly constructed Generalate at  Pattuvam
 Nov 11   2011  Blessing of the newly constructed Novitiate House at Bathery.
 September 28   2012  Exhumation,Identification and Replacement of the Mortal Remains of Mother Petra Dinadasi, the Servant of God in the new tomb prepared in the Ashram Chapel
 Sept.30–Oct. 15   2012    VI General Chapter
 April 10–19   2013    II Provincial Chapter of Vimala Province
 April 13–20   2013    II Provincial Chapter of Amal Jyothi Vice IProvince
 May 8–17   2013    II Provincial Chapter of Nirmala Province
 May 8–18   2013    II Provincial Chapter of Amala Province
 January 6   2014    Rev. Fr. Linus Maria Zucol S.J., Born to Heaven
 September 3   2014    Sr. Daniela DSS, the Superior General, visited His Holiness Pope Francis
 February 13 - 22   2016    III Provincial Chapter of Amal Jyothi Vice-Province
 February 24 - 29   2016    III Provincial Chapter of Vimala Province
 March 10 -18   2016    III Provincial Chapter of Nirmala Province
 March 31- April 9   2016    III Provincial Chapter of Amala Province
 June 1   2016    Closing ceremony of the Diocesan Inquiry of the Canonization of Mother Petra Dinadasi,
   the Servant of God
 June 6   2016    40th Death Anniversary of Mother Petra, the Servant of God.
 June 14   2017     Inauguration & blessing of the Mother Petra renovated Museum  ("Smruthinilayam")  &       DSS  History Museum.