"All our savages, but especially the Hurons, profess to have a special esteem for the all-endearing mystery of the birth of our lord Jesus Christ. I have seen some notable proofs of this given by these latter; they themselves entreated the father, long before the feast-day, to make arrangements so as to celebrate it in the most solemn manner possible. They sent their children to seek for what could be used in constructing a grotto, in which they were to make a representation of the mystery; and I took pleasure in hearing a little girl who, having brought with much care a beautiful sort of grass, said that she had done it in the thought and hope that the little infant Jesus might be Laid upon that grass. Our good Christians made some more serious preparations, For they all confessed; and those to whom permission was given to receive Communion, did so very devoutly, at the midnight mass. The grotto, which was well fitted to inspire devotion, was Incessantly visited; and it rendered a very pleasing although rather protracted Service,— to draw from them the expression of their feelings as they themselves express them, when addressing the divine child."
Link (here) to the Jesuit and Allied Relations.