How can I mount a projector to a concrete ceiling?
Berkeley, CA has a tool library for just this kind of rental.  Major home stores have rentals, and there are chains of rental shops like Hertz Rentals.

You'll need a drill, a masonry bit, and a concrete anchor.  Your local hardware store can supply the last two.  Each anchor will have a specified hole size. 

The ceiling is almost certainly not cinderblock.  But it could be reinforced concrete, which is a good strong material to anchor to.