We've added a new feature to Resercal. Now members can add themselves to the waitlist for a day, multiple days, or a custom time-slot that another member has reserved.
If the member that made the original reservation cancels for whatever reason, the first person on the waitlist automatically gets assigned the reservation. As the successful waitlister you'll get an email confirming that you are being assigned the reservation with a link for you to check the details. You can also cancel if you don't want the reservation any more.