How do I sign up for an IMR Trip and how does it work?

Each trip description in the calendar has a contact name/Trip Leader. All you need to do is a) assess if your fitness and ability are in line with the trip demands and b) call or email the Trip Leader to sign up. Most trips are limited to 12 or fewer people so that you and your co-participants aren't literally tripping on each other, or damaging a fragile trail with too many feet.