I invited him to my wedding function for the sake of neighbor.
Please check the sentence with "for the sake of neighbor".
"neighbor" needs an article or other determiner; for example, "a neighbor", "my neighbor" or whatever is appropriate. Apart from this, the English is OK. With no more information, I can't say for sure whether "for the sake of" expresses the correct meaning for your context.
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"neighbor" needs an article or other determiner; for example, "a neighbor", "my neighbor" or whatever is appropriate.
Apart from this, the English is OK. With no more information, I can't say for sure whether "for the sake of" expresses the correct meaning for your context. It sounds as if your neighbor was also attending, and very much wanted this person to be at the function, or would