Judges 1-4, 19

First of all in Judges 19, what is a concubine?

Second of all, why did the girls father want to continue to keep him overnight? By repetition, he was fortifying himself to repeatedly stay the night, but what exactly was that about?
And then when the man finally left he came upon another older man to take him in to get cleaned up and fed along with his concubine. My question is, why did someone come knocking on the door for this man? What did he do that made another want intercourse with him?

I was also confused about the idea of why the old man was about to hand over his virgin daughter to save this other man that he does not know anything about?

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