1. A memory stick with ALL your talks on it. Not only the 4 or so you are going to give, but any others you might have. You may be asked to give more. Your PC may die – mine did and I had to borrow one from another speaker. It went fine but was bit tacky. Without my USB stick I would have been hosed. Extemporaneous without images is pretty poor. All the ships require PowerPoint or other presentation tool.