Arranging meets/events are a thankless task and does take effort/planning to not waste everyone's time.
That last note won't have the desired effect. I like a few others have been arranging meets for years and years on this forum and previous clubs, paid or not paid you get no shows. The same goes for christmas parties, meals, drinks nights, birthdays, weddings etc
For a total no show to a space limited meet, the next time they post interest for a space limited meet #reservelist