The days when clarinets could be seen and not heard are past. Judges pay very little attention to size, uniforms, etc. Just like an elephant, a 400 piece band is impressive just by being there. However, judges give no points just for being there. At most contests, judges ignore who has the nicest uniforms, the prettiest flags or the best props.
Judges can only judge the one performance they see.
Judges do not know how hard the kids have worked. They don't know that the soloist got sick. They don't know that the band performed the show better last week. They don't know what special adversity your band overcame. If they knew, they might be even more impressed than you are.