One thing I do when it comes to the "contact" word is I don't call it that. I call it terms and conditions and I send it through to my client before we meet, then when we do see each other face to face, they can ask any questions that might concern them. A contact is not suppose to be a one sided thing, but just an agreement between two parties. The most important thing that should be stated in the contact is, what you expect of your photographer.
Here are a few suggestions that you should require from your photographer that should be clearly stated in the contact:
1) The time agreed on, that your photographer will be taking photographs. (Something that should be discussed and that you should know, is what does he/she charge if you ask them to stay an extra hour) People don't always thing about this, and then get a big bill from the studio, on hourly rate.
2) The amount of photographs you can expect on delivery as well as the formats those photographs will be given to you in. For example, some photographers give only high resolution photographs for printing. Others give High and Low Resolution photographs, for printing and low for web posting and email purposes. Other photographers add their name to all low resolution photographs. This should be clearly stated as you might not want their name, on all your viewing photos.
3) One last thing that is very important that you should know is weather your photographs will be used by your photographer, for advertising and portfolio purposes. If you are a very private person and do not want your photographs on the web, you should mention that to your photographer. They have to get your concert before using your photographs even tho they took the photographs. Most of my clients do not mind if I use their photographs for portfolio, but you get people who are more private and want things kept for themselves.
The most important thing to remember is that the contact that your going into with your photographer should be beneficial for both parties and you should be very clear on knowing what you get.