We had an almost normal Xmas play with a few sensible additions. Limited tickets per family, 2 shows to keep numbers manageable, chairs in pairs, spaced out as best as possible.
The queue skipping/seat saving is pretty standard, people are muppets. Our first nativity was 2 years ago, parents were asked to come and help get their kids dressed before the show. Noticed a load of parents dropping their kids at the door and thought how sad, they must not be able to come to the show. Went round to the church and they're all sat on the front row with all the grandparents. Always the same people everytime since.