Think of a name for the trip (the city you're visiting, and/or the convention you're going to) and write it in big letters with a marker at the top of the page. Put the page somewhere it won't get lost. If you come up with more info about the trip later on, add it to the page. A checklist of things to bring is a very good idea, as is a timetable of where to be and what to do on which dates.
When you go on the trip, take the info sheet with you. It will come in handy. I've been doing this for several years and I've got it down to a science. :}