| February 05, 1970 | Golden Jubilee Celebrations inaugurated at Calcutta by Mrs Indira Gandhi, the honourable Prime Minister of India
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| 1971 | Class of Corporate Membership -'FELLOW (FIE) instituted
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| February 16, 1980 | Diamond Jubilee Celebrations inaugurated at Calcutta by His Excellency Shri M Hidayatullah, the Vice President of India
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| 1981 | The 'Engineering Staff College of India (ESCI)' formally established at Hyderabad
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| 1985 | The 'Rural Development Forum (RDF)' formally established at Calcutta
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| 1985 | 'National Design and Research Forum (NDRF)' formally established at Bangalore
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| 1986 | 'Water Management Forum (WMF)' formally established at Ahmedabad
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| 1987 | First Indian Engineering Congress held at Calcutta and inaugurated by Shri Rajiv Gandhi, the honourable Prime Minister of India
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| 1992 | The monthly publication 'Bulletin' bifurcated into a monthly colour tabloid ‘IEI News’ and the colour quarterly magazine 'Technorama'
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| 1993 | Class of Non-Corporate Membership - ASSOCIATE (AIE) instituted. First IEI Convocation held at Ranchi
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| December 17, 1994 | Platinum Jubilee Celebrations held at Calcutta, inaugurated by His Excellency Dr Shankar Dayal Sharma, the honourable President of India |