In principle, it sounds like a good idea. However, one of the problems with fight and fighter photography is that it's hard to avoid cliches. You know the sort of thing. Gumshield and sweat flying as the KO punch connects, fighters posing at weigh ins with their guard up etc.
There's nothing wrong with that per se. They are useful illustrations to go with fight reports, on fighter profiles etc. However, to work as an art exhibition which would have a wider appeal than just fight fans you might need to think about including (even commissioning?) pictures by photographers who don't usually phtograph fights who might do interesting things with the use of light, multiple exposures etc to go with the usual kind of thing