On that day they read in the book of Moses in the hearing of the people; and in it was found written, that the Ammonite and the Moabite should not come into the congregation of God forever;
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George Leo Haydock
AD 1849
That day, is often used for an indefinite time. (Haydock)
It is not probable that all this happened when the walls were dedicated. After that event, Nehemias rather went to court, and remained there about ten years. During his absence, many abuses crept in, which he endeavoured to remedy, (ver. 7.) perhaps on the solemn day of tabernacles, when the law had been read.
Ever, (Deuteronomy xxiii. 3.) so as to marry. (Calmet)