How to set up a class waitlist that actually fills seats

A waitlist is the highest-return feature in class scheduling, because it converts a cancellation — pure lost revenue — back into a filled seat. But most waitlists fail for a mundane reason: they depend on a human noticing.

Here is how to design one that works while you are teaching, sleeping, or commuting.

Rule 1: promotion must be automatic and instant

When a booked client cancels, the next waitlisted client should be promoted and emailed immediately. Cancellations cluster in the last 24 hours before class, which is exactly when you are least able to check your phone. If promotion waits for you, the seat usually stays empty.

Rule 2: decide what promotion means for payment

There are two defensible approaches. Pick one and state it clearly at signup.

Charging on promotion produces higher attendance. Reserve-then-confirm produces fewer refund requests. If you choose reserve-then-confirm, keep the confirmation window short — one to two hours — or the seat effectively stays blocked.

Rule 3: set a promotion cutoff

Promoting someone forty minutes before a 6am class is not a favor. Pick a cutoff — two hours before start is a good default — after which the waitlist stops promoting and the seat simply goes unfilled. It respects your clients' time and prevents last-minute confusion at the door.

Rule 4: make position visible

Clients on a waitlist need to know whether they are second or twelfth, because that determines whether they make other plans. Show position at signup and reflect it in the confirmation email. Silence is the reason people abandon a waitlist and book elsewhere.

Rule 5: cap the list

An unbounded waitlist sets up disappointment at scale. Capping it at roughly half the class capacity keeps expectations realistic — and when the cap is regularly hit, you have your answer about adding capacity.

A configuration that works for most small studios

1. 1Waitlist opens automatically when a class reaches capacity.
2. 2Cap the waitlist at 50% of class size.
3. 3On cancellation, promote position one immediately and notify by email.
4. 4Charge or debit the pack credit on promotion, per your published policy.
5. 5Stop promoting 2 hours before class starts.
6. 6Show every waitlisted client their current position.

In Sitz these rules run on their own: full classes open a waitlist, cancellations promote the next client and handle the credit or charge, and everyone involved gets an email without you touching the roster.