If a theatre group offered workshops, each page could explain experience level, exercises and session length. Registration would let participants select a group and describe any previous experience. Staff would then confirm places. A reminder would explain preparations, while a voluntary waiting list would allow interested people to be invited if another session were created later by the organizers.
An illustrative example to adapt to your business. It does not represent a completed project in this municipality.
Would an audition be required to register?
The site should reflect the actual format. An open introductory course can say so; an activity requiring a preliminary meeting should explain that stage before confirming participation.
How should a trial class appear?
It should have its own date, capacity and arrangements. Visitors would understand whether attending the trial also reserves a place in the complete session or requires a separate registration.