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Explanation: I may suspect that this is a "love letter". He/she is dating a partner and on Saturday, when people do not work in the fields, the lovers are to meet there quietly. Very romantic and back by some pieces of Russian folklore.
Thank you very much for the translation help and the background information. I was having trouble with the word вестка. Also, being an american, I'm not very familiar with Russian folklore, so thanks for that info as well. Jim 4 KudoZ points were awarded for this answer