I assume you are doing your own printing. One-hour labs will normally make a mess of this.(posted 9166 days ago)How much light do you have, in other words what aperture/shutter were you shooting at, with EI 3200?
I do a load of stage stuff, with Delta 3200, rated at 800. Usually 1/60s at f/1.8 or f/1.2. 8x10 prints are great, with very little grain, beacause the film is 'correctly' exposed, and not pushed. However, the backdrop is black, and shows very little detail in the negatives, and there is very little depth of field.
If I had a little more light, I could use Delta 400, with even finer grain.
If you need to push the film, and can't use a larger aperture or longer shutter, then you need more light. Can you talk to the organisers, to get more light? Flash may be an answer; ideally monoblock units, on stands. If you go this route, you can use a slower film, such as Delta 100.