When the people of Israel left Egypt they did not leave alone. They left with a mixed multitude of many people (Exodus 12:38). What happened to the mixed multitude in the desert and, specifically, after the giving of the Torah? We hear of all the tribes, where they camped in the wilderness, etc., but I do not recall hearing again about the mixed multitude. What might have become of them? Do we have a tradition on this? Beyond a place in the camp layout, should they not have raised the issue of conversion or intermarriage - for the first time after receiving the Torah?
(This question is different from a similar question, What happened to the Eirev Rav?, which discusses what happened to the mixed multitude after the people entered Canaan.)