Reference for Avodah Zarah 16:1

כל תלתין יומין בין א"ל מחמת הלולא ובין לא א"ל מחמת הלולא אסור מכאן ואילך אי א"ל מחמת הלולא אסור ואי לא אמר ליה מחמת הלולא שרי

during the entire thirty days [following a marriage celebration] whether he said to him that he was inviting him because of the banquet or not it is forbidden. From that time onward, if he invited him because of the marriage, it is forbidden, but if not, it is permitted.

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