Yes, please. This clearly sets out what everyone should expect and avoids any misunderstandings, particularly on the day of the presentations. Written into the contract will be:

• Details on the lecture
• Who will provide the lecture
• When and where the lectures will be presented
• How the speaker is to be transported and accommodated
• What the organization needs to provide the speaker
• What compensation package has been arranged and when it is due
• Any other important details