How can I throw a Halloween party on a budget?

My partner has volunteered me to host a bash – what should I do to make it go with a bang?Every week a Guardian Money reader submits a question, and it’s up to you to help him or her out – a selection of the best answers will appear in next Saturday’s paper.My partner has generously volunteered me to host a Halloween party for a gang of 11-year-old girls. I can’t leave the country, so I need some top ideas on how to pull this off – all on a super-low budget. W