I agree that the date for that show seems wrong and that it's more likely to be late winter or early spring 1970. Zoork 1 - where have you seen that poster and eyewitness reports? I've never heard of a gig on that date - every gig listing I've seen shows the band playing in Stockholm on 1 April and Helsinki on 3 April but nothing on 2 April. You might have discovered a new show!
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