Sounds to me like they are using you and your team for other than what they should be used for. If they are going to use your team for these other things than I would go to leadership and tell them they need to turn around and help you and your team finish your work and definitely fight for all...
Doesn't seem right to me either, 135 hours to set Halloween and mini in the same week! I would like to meet the guy that decided that and see him do it! lol