From top to bottom and from left to right:
1st row:
Lucia Moholy,
Alfréd Kemény,
László Moholy-Nagy.
2nd row:
Lotte Burchartz,
El Lissitzky (with pipe and cap),
Cornelis van Eesteren,
Bernhard Sturtzkopf.
3rd row:
Max Burchartz (with child on his shoulders),
Harry Scheibe,
Theo van Doesburg (with paper hat),
Hans Vogel,
Peter Röhl.
4th row:
Alexa Röhl (in all black),
Nelly van Doesburg,
Tristan Tzara,
Nini Smit,
Hans Arp.
5th row:
Werner Graeff and
Hans Richter (on ground).
Note: "Nini Smit" close to Hans Arp is
Sophie Taeuber (who will marry Arp on the 20 Oct. 1922).
(left to right) - Upper row: Max and Lotte Burchartz, Peter Röhl, Vogel, Lucia and László Moholy-Nagy, Alfred Kemeny.
Middle row: Alexa Röhl, El Lissitzky, Nelly and Theo van Doesburg, Sturtzkopf.
Lower row: Werner Graeff, Nini Smit, Harry Scheibe, Cornelis van Eesteren, Hans Richter, Tristan Tzara, Hans Arp.
Congress of the Constructivists and Dadaists [Congrès des constructivistes et des dadaïstes à Weimar] was held in Weimar on 25-26 September 1922.