I'm feeling a wee bit stressed at the minute .
It's December and there's lots going on for everyone .
The problem is I'm getting a bit annoyed with extra unnecessary demands on my money and time [anger]
Our project manager has decided he wants us to produce a nativity scene to decorate our office - a huge stable back drop with cardboard cut outs . We are all expected to contribute to making it and buying materials . Our work is seasonal so our actual projects are quiet , but we will also be expected to take the nativity work home 
It was then decided we should also have a Christmas cake sale.
Our last day in the office before Christmas closure is Saturday - it has been decided we will all bring in a dish for a nice lunch . I was told our project manager will let me know what I am to contribute - I declined and said I'd bring my own lunch.
Now I look like a Scrooge but I don't feel I should care . Unbeknownst to my colleagues , I have a health problem which means I'm on a very strict diet so I wouldn't eat their dishes anyway .
The main issue though is that I have DC who need new Christmas party attire , nativity costumes , bake sale items , Christmas fete donations , activities and the associated Christmas stuff to go with that .
I feel like I'm rushing through December.
Money is tight . I don't have the time or the cash for all this extra stuff I'm feeling pressured in to .
AIB a Scrooge or am I well within my rights to just say no thank you ?