To the OP:
I personally try and always call the visiting band director by Wednesday or Thursday just to touch base. In addition to making sure they have my number I can also get a feel for if we have to deal with them having a drill team or something. I can also warn them about any special pregame events that are happening that we don't want to interrupt. As long as I'm not bogged down with something I try and go greet the visiting band director briefly before the game or during first quarter once we've made it to the kickoff.
If we're away I don't typically call myself.