How to write a clear confirmation text message before a tour group departs

A pre-departure confirmation text for a tour group shouldn't look too much like a generic notification template. What guests really need is how to avoid mistakes on the day: what time to arrive, where to wait, who to look for, what to bring, and what to do if they are late. I used to send very long instructions, but guests only read the beginning and still asked the same questions when they…