I see now what you have in mind. Yes, I think you could use tulle or similar fabric to create a false ceiling beneath the hanging lights in the reception hall. I am not sure about using double sided tape on the balloons to keep them in place. It might cause them to burst. I suggest you test it first on a few balloons and see if it works. As an alternative solution, you could perhaps create some sort of border with the tulle to hinder the balloons from drifting away.
If you do an image search on Google for "false ceiling tulle" you'll get some inspirations for your decoration.
Good luck and I am sure our readers would love to see a photo of your decor. Simply come back to our FAQ page and submit it.