Being a school, it's a safe bet there will be a ceiling over the stage area. If it is a suspended type ceiling, you can always remove the ceiling panels, gaining acess to the suspention dropers, which are nomaly structualy  anchored. This will allow you to dead hang the cloth & any other border or leg masking as well.
I assume there are also visable anchor pionts for the back tabs, house rage or lighting batterns? These can be utalised for a tempory grid that would support a backdrop, using wire cables with turnbuckles for tightening.
It may be worth while for the school to install a cyc traveller battern & track upstage.
Also they could easily skin the deck with sheets of MDF or plywood & under gaffer tape. This will allow for flats bracing & painting of the deck, as a stable floor to screw into.

Most 'achytex' think only about the accetics of a performing spaces, rather than the practical workability of staging a production.
It's all thier fault as generaly thier only experiance in theatre, has been gained by recieving a comp once upon a time to actuauly see a show.
Every time I have anything to do with them it is like talking to a brick & the response is just as dence?
Normally I get involved with the finished building, which has to be modified & reworked to do a show.
But even when I'm in on the planning stage of a project, these wally's end up doing thier own thing.
Unfortunetly I always find upon taking these yoyos to task they imediatly apply the '3D' principle of Duck, Dive 'n Disappear!
But thats all another story!
With a miriad of multi purpose built gymeatres, theatoriums & commeneus.


Edited by JoeMc - 4/09/10 at 11:37pm