GOOGLE TRANSLATION - De tĳd: Dagblad voor Nederland - 1969-08-22
IN BILZEN, ROTTERDAM AND AMSTERDAM Three-day pop marathon
From our reporter * AMSTERDAM, Aug. 22 —
The coming weekend, August 22, 23 and 24, a strongly occupied pop marathon will be organized in three places at the same time, in which 1 next to nine English pop groups the most successful Dutch pop formations will be on view, in addition to presumably a performance of the musical "Hair" by the London cast. The groups will, according to an op ; paper watertight scheme, performances in Bilzen, Rotterdam and Amsterdam. When "Hair" is actually performed, it will only take place in Bilzen.
Peter's diary has 'Belgium, Bilson Pop Festival' crossed out, so, it looks like they were due to play the Bilzen festival. Many of the same acts were due to play in De Tempel, Rotterdam (cancelled very last minute due to venue not getting a license) and Paradiso, Amsterdam. In the end YES didn't play any of these shows.
The name of the city should probably be Lekkerkerk