Session format typically starts with a warm-up period followed by doubles play, though singles or Canadian (2 vs 1) will be necessary if attendance warrants.
Late cancelations complicates everything for the organizers, sign up if you really plan to attend. If you have to cancel, do it before noon the day of the event to give time for people on the waiting list.
2 no shows, you will be removed.
Please, allow messaging on your profile so that all organizers can get in touch with you. Many have this feature disabled.
Don't hesitate to reach out if you have any questions.