Do you have a dropped ceiling? If yes, then just clip light weight fabric to the drop ceiling with binder clips. Or there are special magnetic clips you can buy to hang things from drop ceilings.
You could also use fish line to give it an invisible drape-y look at the top.
Other photos of tents can be found in the "Temple, Synagogue, Tent..." Photos Forum.
Does anyone have any ideas for tents when faced with no dropped ceiling? Post your ideas.
See below for info about creating tents with fire safety in mind. (To avoid problems with fire marshalls.)
-- Carol