Timeline of Panchayati System in Nepal (1960-1990)

Sep 8, 1914: BP Koirala born
June 11, 1920: King Mahendra born
Dec 29, 1945: King Birendra born

Feb 15, 1951: King Tribhuvan and major leaders of Nepali Congress returned from India after Delhi Agreement with Rana Regime. This day (Falgun 7, 2007) was marked as Democracy day in Nepal.
Feb 18, 1951: King formed a new government according to the agreement. Last Rana PM Mohan Shamsher remained as the PM. Among 10 members of cabinet 5 were from Nepali congress including Subarna Shamsher Rana (Finance), B.P. Koirala (Home), Ganesh Man Singh (Commerce and Industry).
Nov 12, 1951: PM Mohan Shamsher resigned
Nov 16, 1951: Matrika Prasad Koirala as PM
Aug 14, 2052: Direct rule of King Tribhuvan
June 15, 1953: Matrika Prasad Koirala as PM
Mar  13, 1955 : King Mahendra ascended the throne of Nepal.
Apr 14, 1955: Direct rule by King Mahendra
Jan 24-25, 1956: Sixth National Convention of Nepali congress held in Birgunj. Subarna Shumshere elected as the President. 
Jan 27, 1956: Tanka Pd Acharya as PM

Feb 25-28, 1957: Chinese PM Zhou Enlai visited Nepal
Jul 26, 1957: Dr. K.I. Singh as PM
May 15, 1958: Suberna Samsher Rana as PM
Feb 12, 1959 (2015 Falgun 1 B.S.): King Mahendra promulgated the new constitution.
Feb 18, 1959: First general election of Nepal. Congress got 2/3 majority (74 seats out of 109)
May 27, 1959: BP Koirala as PM
May 7-13, 1960: Seventh National Convention of Nepali Congress held at Kathmandu. Bishweshwar Prasad Koirala as president.
1960: USSR President Marshal Voroshilov visited Nepal
1960: Chinese PM Zhou En-lai visited Nepal for second time.
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Dec 15, 1960 (B.S. 2017 Poush 1): King Mahendra dissolved the parliament, suspended the constitution, and imprisoned the PM BP Koirala and other leaders.
Dec 26, 1960: King Mahendra appointed a council of 5 ministers to help run the administration. Tulsi Giri as PM
Jan 1961: UK Queen Elizabeth and Prince Philip visited Nepal.
Dec 1961: Nepali congress started armed revolution. 
2018 Falgun 7: election of Gau-Panchayat held.
2019 BS: Election of City-panchayat, Jilla-Panchayat and Anchal-panchayat one after another.
Apr 13, 1962 (B.S. 2019 Baisakh 1): King Mahendra laid the foundation stone of Mahendra Highway in Gaidakot, Nawalparasi. 
Nov 8, 1962: Nepali congress called off the armed insurrection and adopted peaceful means for struggle amid Indo-China war (20 Oct - 21 Nov 1962)

Dec 16, 1962 (B.S. 2019 Paush 1) : King Mahendra promulgated the new Constitution of Nepal (नेपालको संविधान २०१९). The new constitution created 4-tire Panchayeti System (पञ्चायत): Village/Town Panchayat, District Panchayat, Zonal Assembly & National panchayat.
Dec 23, 1963: Surya Bahadur Thapa as PM
Feb 26, 1964: Tulsi Giri as PM (2nd term)
Jan 26, 1965: Surya Bahadur Thapa as PM (2nd term)
1967: Back to the Village National Campaign (Gaau Farka, गाउँ फर्क राष्ट्रिय अभियान) was implemented until 1975.
Oct 30, 1968: BP Koirala and many other leaders released from the prison. BP went to India.
Apr 7, 1969: Kirti Nidhi Bista as PM. 
1969: Indian PM Indira Gandhi imposed economic blockade to Nepal. Nepal government removed Indian military missions near Tibet border and Jawlakhel.
Apr 13, 1970: Gehendra Bahadur Rajbhandari as acting PM

1971: First Election of National Panchayet held.  Total 125 members; out of them 16 were appointed by the King, 90 were elected by Zonal Assemblies, 15 were elected by class organizations and 4 were elected by the collage graduates.
Apr 14, 1971: Kirti Nidhi Bista as PM (2nd term)
Jun 27, 1971: Prince Dipendra, son of then Prince Birendra, born
Nov 1, 1971: New National Education System (राष्ट्रिय शिक्षा पद्धतिको योजना २०२८) implemented.  Two districts Chitwan and Kaski was selected for the first phase.

Jan 31, 1972: King Mahendra died. Birendra became the new King of Nepal.
Aug 24, 1972: BP Koirala started armed revolution against the Panchayati System from India.
Jul 16, 1973: Nagendra Prasad Rijal as PM
Dec 1, 1975: Tulsi Giri as PM (3rd term)
Feb 24, 1975: Coronation of King Birendra. He presented the proposal to recognize Nepal as a zone of peace. Eventually recognized by 116 countries except India.
2032 BS: election of village, city and district panchayats held.
June 1976: King Birendra visited China. Chine supported Nepal's zone of peace proposal.
Dec 30, 1976: BP Koirala returned Nepal and arrested.
Sep 12, 1977: Kirti Nidhi Bista as PM (3rd term)


 Student Revolution of 1979/80 (छत्तिस सालको बिद्यार्थी आन्दोलन)
Apr 6, 1979: Students protested against the execution of Zulfikar Ali Bhutto, former PM of Pakistan. remembered as the start of Nepali Revolution of 1979/80.
Apr 23, 1979: Ascol clash between police and students. 3 students killed.
Apr 27, 1979: people in Hetauda kept a Minister hostage for 10 hours. Police responded, 3 to 17 peoples died. Next day many leaders arrested. BP Koirala was kept under house arrest.
May 2, 1979: King Birendra formed 5 member commission to find the solution for the unrest.
May 23, 1979: King Birendra made a public declaration that a referendum with secret vote would be held.
May 30, 1979: Surya Bahadur Thapa as PM (3rd term)

1980: Namita Sunita Kanda : School girls Namita Bhandari, Sunita Bhandari and Neera Parajuli, were raped and murdered in Pokhara, Nepal. The bodies of all three girls were found in the Gandaki River. The only witness Churamani Adhikari, employee of forest dept was taken to police station but next day he was found dead, later police decleare that as suicide. The Namita-Sunita case was closed inconclusively in 2003.  (L)

May 2, 1980: Referendum (२०३६ सालको जनमत संग्रह) on non-partisan panchayat system or a multiparty system. The panchayat system received a slim majority of 54.8%. Voter turnout was 66.9%.

May 9, 1981:  Second Election of National Panchayat held. Political parties were still banned. In total 140 seats 28 were appointed by King and 112 were to be independently elected. Two pre-panchayat PM also contested. Matrika Prasad Koirala lost the election where K.I. Singh won. 70% of the candidate unofficially supported by the state lost the election. 
May/June 1981: Chinese PM Zhao Ziyang visited Nepal
2039 BS: 4022 village, 29 city and 75 districts panchayat election held.
Jul 21, 1982: Leader of Nepali Congress and former PM BP Koirala died.
Jul 12, 1983: Lokendra Bahadur Chand as PM
March 19, 1984: Chinese President Li Xiannian visited Nepal.
May 23, 1985: Nepali congress started Civil Disobedience Movement (सत्याग्रह). More than 12000 party workers and sympathizers voluntarily went to jail for several months.
Mar 21, 1986: Nagendra Prasad Rijal as PM (2nd term)
2043 chaitra 7 & 10 BS: local election of village and city panchayats held.
1986: UK Queen Elizabeth and Prince Philip visited Nepal

May 12, 1986: Third Election of National panchayat held.  1,548 candidates ran as independents for 112 seats where as 28 were appointed by the king.
Jun 15, 1986: Marich Man Singh Shrestha as PM


Indian official blockade of Nepal in 1989/1990
Dec 1987: India warned Nepal not to purchase antiaircraft gun from China.
March-1988: Nepal made a deal to purchase Chinese weapons

July 22, 1988: Indian PM Rajiv Gandhi sent his foreign minister Natwar Singh to Nepal to urge not to purchase weapons again from China. King Birendra refused.
Aug 21, 1988: 6.9 rector scaled earthquake hit Nepal. Over 700 killed.
March 23, 1989: Nepal-India Trade and transit treaty expired. India refused to renew. Since then India officially imposed blockade in Nepal until Apr 1990.
Apr, May 1989: Nepal bought fuel from China.
Oct 5, 1989: Nepali foreign minister Sailendra Kumar Upadhaya raised the issue of blockade in UN without mentioning India.
Nov 1989: Chinese PM Li Peng visited Nepal. In Kathmandu he said: "all countries, small or big, should be treated equally. Problems and disputes should be handled according to five principles of peaceful co-existence".

Revolution 1990 / People's Movement 1 (जनआन्दोलन भाग १)
Jan 18, 1990: Nepali Congress called for a decisive movement for the restoration of democracy and welcomed other parties to join.
February 18, 1990 (Falgun 7, 2046 B.S.): Nation-wide Movement for Restoration of Democracy was started by Nepali Congress and Left front of seven Communist Parties led by CPN (ML).

Apr 6, 1990: Lokendra Bahadur Chand as PM (2nd time) [13 days]
Apr 8, 1990: Panchayat System fell, King Birendra removed the ban on political parties.

Apr 19, 1990: Krishna Prasad Bhattarai from Nepali Congress became PM

Apr 1990: India removed the 13 months blockade in Nepal.
June 1990: PM Bhattarai visited India and met Indian PM VP Singh. India removed the blockade.
Dec 9, 1990 (B.S. 2047 Mangsir 23): King Birendra promulgated new constitution of Nepal. (नेपाल अधिराज्यको संविधान, २०४७)
March 1991: CPN (ML) and CPN (Marxist) united to form CPN (UML)
May 12, 1991: First election after restoration of democracy. Nepali congress won majority (110 out of 205) seats. CPN UML got 69 seats where as future maoist party Samyukta Janamorcha became 3rd party winning 9 seats.
Jan 27-Feb 2, 1993: 5th convention of CPN UML, party adopted People's Multi-party Democracy.

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references:-

http://uca.edu/politicalscience/dadm-project/asiapacific-region/nepal-1946-present/