1883/10 the assembly ‘les XX / Vingt’ is founded by art-critic Octave Maus and a group of 20 unskilled artists and starts to organize yearly exhibitions for national and international avant-garde artists in Brussels (R5,p214)
1886/02/06-03: with Monet (10x), Redon, Renoir (8x); Degas refuses (R5,p148; R22IV,p1017; R31,p315)
1887, Februar: with Seurat (La Grande Jatte+6 seascapes) (R39,p301; R40,p93)
1888/02/05-?: Ve exposition; with Signac, Anquetin, (R39,p325+645-)
1889, spring: VIe exposition; with Monet (4x?), Seurat (12x), Angrand, (R22IV,p1017; R40,p93+645-)
1890/01/17-03: VIIe exposition; with Renoir (5x), Signac. Cézanne (R31,p315; R39,p325; R3,p653)
1893: the abolishment of les XX and the foundation of ‘la Libre Esthétique’ now solely by Octave Maus (R5,p214)
all Impressionists exhibited at these Salons except Caillebotte (R5,p214)