ΠΡΟΣΚΛΗΣΗ ΕΚΔΗΛΩΣΗΣ ΕΝΔΙΑΦΕΡΟΝΤΟΣ ΥΠΟΒΟΛΗΣ ΠΡΟΣΦΟΡΑΣ ΓΙΑ ΤΗΝ ΟΡΓΑΝΩΣΗ ΚΑΙ ΣΥΝΤΟΝΙΣΜΟ ΤΗΣ ΕΚΔΗΛΩΣΗΣ “ΛΕΥΚΗ ΝΥΧΤΑ”

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