The first number (of 6 published) mimeographed/photocopied in blue, in a very small edition, with original artwork stapled under plastic covers, produced and published in Antwerp September 1965 by Panamarenko, Hugo Heyrman, Wout Vercammen and occasionally Yoshio Nakajima, - (Blue issue): WHAT'S HAPPENING. 16 pages. 4to. Very rare.
Published by Panamarenko and others from the Antwerp Happening Scene. According to the Bibliography included in Happening & Fluxus, Materialien, Koelnischer Kunstverein 1970, there were 6 issues published, nos. 3-6 under a different title (Milkyways).