All pieces should be completed and finished with polyurethane or stain at that time. If you use spray polyurethane you will need to spray outside and on a large piece of cardboard that you provide. Do not spray on the cement.
Be prepared to discuss your sculpture. Why did you make what you made? What inspired you? Was there any influences? What are you trying to convey to the viewer? etc. Also be prepared to ask questions to your peers. The critique plays a large role in my determination of your grade so your participation is essential.