How to make an ugly banquet hall pretty??

So we found this community banquet hall that is in a great spot for our guests, is big enough, doesn’t have many rules and is a great price ($235 for 3 DAYS!) problem is...it’s a bit on the old and ugly side. I’m looking for ways to make it prettier ❤️ Also we’re on a budget so I can’t afford to add drapery on all the walls and it’s pretty big to try and relight the whole thing. Thoughts? I’ve also included my plans for the layout of the wedding
thank you!!