The closing remark should provide a concise summary of the points made in the rest of the speech. Frequently, in the closing remarks, is a statement of the next course of action. Some people use closing remarks to thank each other and bid them farewell. The closing remark may be what the audience will remember most about the talk. One or two short sentences at the end, with Words very well chosen provide an effective closure to the talk.
Remember that this is the last opportunity you may have to say goodbye to friends. You may want to say something like "I wish each of you well on all of your future endeavors. I will cherish the time we have spent here together and will fondly remember these days. I look forward to watching you Excel in your futures and hope that we can stay in touch. I am glad to have had the opportunity to have shared this time with you. Good luck!" Make sure you say everything that has been unique about your experience. This may be the last time that everyone is together in one room.