There are four problems with having a band that exceeds 300 people
When doing a run though beware of two things, trombones and color guard. Especially clarinets. It seems that many band directors like to place 6 foot flags next to 3 foot wind instruments. It doesn't end well for the clarinet, believe me.
When challenging a tube, make sure to have three things in mind. A) Unless you are skilled in the art of beat-the-hell-out-of-some-one-with-an-instrument-or-color-guard-equiptmen fu, or are crazy, anyone below the size of 5 foot 2 you will loose. B) the shorter the tube player, the meaner they can be. C) make sure you don't dent the tuba, or they fly into a rage.
Make sure you know what colr guard member is next to you, especially if they have a saber. Bass Clarinets have it the worst, if the wind decides to push that sucker a degree the wrong way it goes down the tube, litterally!
When in a band exceeding 300 people, many accidents tend to happen. For example, one of the three things listed above or other things like, eye loss by flute or death by drum.
Remember my fellow band geeks, band is a fun experience, and try to be safe.