"The External Examiner, Tim Webb, is visiting on Monday 20th May. It is very important that you are available from 1.30pm in the CGA studio area as he may wish to discuss your work with you. Please ensure that you are present and prepared to speak to Tim if needed. Thank you."
External Examination of your student work is a normal and necessary part of the academic process and nothing to worry about. Tim Webb may talk with you - he may not - the important thing is to be available should he want to. If for some reason you're unable to attend, please let me know. Many thanks.