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World Congresses and Plenums of Comintern

Delegate figures are voting plus consultative.

Event	Year held	Dates	Location	Delegates
Founding Congress of the Communist International	1919	March 2–6	Moscow	34 + 18
Conference of the Amsterdam Bureau	1920	February 10–11	Amsterdam	16
2nd World Congress of the Comintern	1920	July 19 to Aug. 7	Petrograd & Moscow	167 + ≈53
1st Congress of the Peoples of the East	1920	September 1–8	Baku
3rd World Congress of the Comintern	1921	June 22 to July 12	Moscow
1st Congress of Toilers of the Far East	1922	Jan. 21 to Feb. 2	Moscow & Petrograd
1st Enlarged Plenum of ECCI	1922	Feb. 24 to March 4	Moscow	105
2nd Enlarged Plenum of ECCI	1922	June 7–11	Moscow	41 + 9
4th World Congress of the Comintern	1922	Nov. 5 to Dec. 5	Petrograd & Moscow	340 + 48
3rd Enlarged Plenum of ECCI	1923	June 12–23	Moscow
5th World Congress of the Comintern	1924	June 17 to July 8	Moscow	324 + 82
4th Enlarged Plenum of ECCI	1924	June 12 and July 12–13	Moscow
5th Enlarged Plenum of ECCI	1925	March 21 to April 6	Moscow
6th Enlarged Plenum of ECCI	1926	Feb. 17 to March 15	Moscow	77 + 53
7th Enlarged Plenum of ECCI	1926	Nov. 22 to Dec. 16	Moscow
World Congress Against Colonial Oppression and Imperialism	1927	February 10–15	Brussels	152
8th Enlarged Plenum of ECCI	1927	May 18–30	Moscow
9th Enlarged Plenum of ECCI	1928	February 9–25	Moscow	44 + 48
6th World Congress of the Comintern	1928	July 17 to Sept. 1	Moscow
10th Enlarged Plenum of ECCI	1929	July 3–19	Moscow	36 + 72
2nd Congress of the League Against Imperialism	1929	July	Frankfurt
Enlarged Presidium of ECCI	1930	February 25-??	Moscow
1st International Conference of Negro Workers	1930	July 7–8	Hamburg	17 + 3
11th Enlarged Plenum of ECCI	1931	March 26 to April 11	Moscow
12th Enlarged Plenum of ECCI	1932	Aug. 27 to Sept. 15	Moscow	38 + 136
13th Enlarged Plenum of ECCI	1933	Nov. 28 to Dec. 12	Moscow
7th World Congress of the Comintern	1935	July 25 to Aug. 21	Moscow