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the 'Montreux Music' site (www.montreuxmusic.com/crbst_204.html) claims Yes played on the 24th and 25th, but Peter Banks's diary only records a gig on the 25th. The diary also records that on the night of the 24th, Yes were en route to Montreux and didn't arrive until 11 pm, which makes an April 24 gig unlikely.

[Original - French]: "YES s'est produit à la Rose d'Or de Montreux les 24 et 25 avril 1969 et donné un concert au Casino le 2 décembre 1969. C'est à ce moment là que YES rencontra pour la première fois Patrick Moraz."

[Translated - English]: "YES played a gig at the Montreux Golden Rose Festival, April 24th and 25th 1969 and a concert at the Montreux Casino December 2nd 1969 this is when they met Patrick Moraz for the first time."