|A former member||
We're looking forward to a great hike on Monday. As you may know, we are already "oversubscribed," with 25 confirmed, and several others on the waiting list.
As a courtesy to those waiting, please be sure to update your RSVP ASAP, should your plans change. Given the specified degree of difficulty of this hike, and to better ensure the enjoyment of all, I also ask that you privately confirm your fitness and experience level, if you have not previously hiked with me.
See you then