When planing to be at cons you need to have things in place and be aware the day after a con you will be spent and have to travel. It is very important to always have all your done before a Con and make deadlines for after cons at least 3days later to make sure if you get sick you have tie to get over the hump of being sick. Trust me this is just smart thought process and if all goes well you will have time to get ahead if things go south you have a safety net.