How do you transform a function hall into An Evening Under the Stars event on a budget?

Hello- I am holding a fundraising event for my church and the name of it is Evening under the Stars. We are hoping to create a ceiling with gossamer and use twinkle lights above it to creat a night sky atmosphere. We are looking for more ideas on how to transform the space -walls, entrance etc and do not have a lot of money to work with. Any ideas out there? Thank you!