It seems there are in fact two uses of the word. The Best Christmas Pageant Ever convinced me. I'm not sure if it a language difference (between British/Commonwealth/Australian and American English) or whether one of the uses is a corruption/derivation of the original. I know that the meaning you describe is what I would usually call a nativity play. I'm not sure how to proceed, but one possible option is to turn Christmas pageant into disamiguation page directing readers to both here and the as yet uncreated article nativity play. A note could also be placed at the beginning of this article to inform users of the alternate usage. Thoughts? | talk