Always call your partner before a game. The night before if possible is always best. This gives you the opportunity to discuss a number of things such as the location, where to park, anything that either of you know about the site that's changed. You can discuss the teams and if either of you have seen them before this season and anything about them that might help you officiate the game better. You should discuss assignments as well as mechanics. Don't forget to check on the uniform! It might be a cool day and your partner might prefer a pullover!