1950-1965: Creation of the collection. Acquisition of works from merchants and the artists themselves in exhibitions in Athens, Thessaloniki, Volos and Larissa.
March 1955: Purchase of the furniture of Heinrich Schliemann in Ilio Melathron from a second-hand shop in Athens.
March 1967: First exhibition of 150 works of the collection at the Pervanidio School of Larissa on the initiative of the community association “Aristefs”.
December 1981: Letter to the Mayor of Larissa, Aristeidis Lamproulis, proposing the donation of 631 works to the Municipality of Larissa on the sole condition that a Municipal Art Gallery be established and that a special building be erected to house it.
April 1982: Exhibition of 84 works of the collection (First period) at the City Hall of Larissa.
August 1982: Exhibition of 75 works of the collection (2nd period) at the City Hall of Larissa.
October 1983: Exhibition of 125 works of the collection (3rd period) at the City Hall of Larissa.
October 1983: The Legal Entity of the Municipal Art Gallery of Larissa G.I. Katsigras Museum is established with the purpose of organizing exhibitions, operating workshops and a library and collaborating with the Ministry of Culture, cultural institutions and museums.
January 1984: Exhibition of the Katsigras collection entitled “Modern Greek Art” at the National Gallery.
January 1985: Announcement of a panhellenic architectural competition for the construction of the building of the Municipal Art Gallery in the area of Neapoli.
The study of A. Pikramenos, S. Laggousis, E. Parris, V. Stamoulis, C. Papaevangeliou, I. Vergitsakis is awarded.
January 1986: The contract is signed between the Municipality of Larissa and the designers.
March 1986: The Free Workshop of Visual and Applied Arts is established.
March 1988: The presentation of the collection with the exhibition of 99 works (4th period) at the City Hall of Larissa is completed.
April 1988: Exhibition of the Katsigras collection at the Municipal Art Gallery of Thessaloniki.
1989: The preparation of all the construction designs for the building of the Municipal Art Gallery is completed.
March 1990: Exhibition of the Katsigras collection at the Art Gallery of the Municipality of Athens.
August 1990: Exhibition of the Katsigras collection at the International Festival of Patras.
November 1990: The contract for the construction of the Art Gallery building is signed with contractor the company TECHN-ER S.A. The project is included by the Minister for National Economy, Mr. Georgios Souflias, in the programme of Public Investments and CSF.
December 1990: Foundation of the building.
1992: Two exhibition spaces are created on the 2nd and 3rd floor of the Hatzigiannio Municipal Cultural Centre for the exhibition of 110 representative works.
December 1992: Official opening of the exhibition at the Hatzigiannio Municipal Cultural Centre.
December 1996: Additional donation of 93 works, with the collection now including 724 works.
March 1998: After the death of Georgios Katsigras, 1170 art books of his library, 57 additional works, as well as the furniture of Heinrich Schliemann are bequeathed to the Municipal Art Gallery.
1999: Preparation of a museological design by the architectural office of S. Charalambidou, E. Charalambidou, K. Laskaridis for the necessary arrangements in the building of the Municipal Art Gallery.
1999-2000: Completion of the first phase of works by the company KTITOR S.A.
2000: Donation of 11 works by A. Asteriadis from Nikos and Kostas Asteriadis.
2001-2003: Second phase of the works by the construction company N. Argyriou-D. Provopoulos.
November 2003: Opening of the Municipal Art Gallery of Larissa G.I. Katsigras Museum by the President of the Republic Kostis Stefanopoulos. It is a building of 4,800 sq.m. on a plot of 10,000 sq.m.
2004-2005: Recording of all the collection works by: Irini Orati, Dimitris Pavlopoulos, Konstantina Drakopoulou, Nevenia Pastaka and Aikaterini Stasinou.
March 2019: Opening of the redesigned permanent exhibition of the G.I. Katsigras Collection “RE-CONNECT” with a new museological design from the art historian Syrago Tsiara.